Entries |
Document | Title | Date |
20080258827 | RADIO FREQUENCY VOLTAGE CONTROLLED OSCILLATORS - A radio frequency voltage controlled oscillator and method for designing it are provided. The RF VCO comprises a differential oscillator and a cascoded current source. The cascoded current source substantially provides a constant current bias to the differential oscillator. A first biased transistor in the cascoded current source is connected to the differential oscillator. A second biased transistor is cascoded to the first biased transistor. A low pass filter is cascoded between the first second biased transistors. | 10-23-2008 |
20080258828 | Colpitts Oscillator - A Colpitts oscillator includes a tank circuit, a first transistor, and a first feedback circuit. The first transistor includes a first region, a second region, and a control region. The first region communicates with the tank circuit. The first feedback circuit communicates with the second region and the control region of the first transistor. | 10-23-2008 |
20080278249 | LC-TYPE VCO - Disclosed herein are embodiments of an LC-type VCO with multiple operational frequency bands having reasonably similar frequency vs. control signal slopes. | 11-13-2008 |
20080278250 | System and method for increasing frequency tuning range - System and method for increasing the frequency tuning range of a RF/microwave LC oscillator. An electronic communications device includes a controller to regulate the operation of the electronic communications device, a modem coupled to the controller, a radio frequency unit coupled to the controller and to the modem, an oscillator coupled to the controller and to the radio frequency unit, and an amplifier coupled to the radio frequency unit. The oscillator produces a timing and reference signal for the radio frequency unit based on control information from the controller. The oscillator includes a multi-tap inductor that may controllably alter its effective inductance to change the timing and reference signal provided to the radio frequency unit. | 11-13-2008 |
20080297267 | Voltage controlled oscillator circuit and a method for configuring a voltage controlled oscillator circuit - The voltage controlled oscillator (VCO) circuit comprises a tank circuit, a first tuning section comprising first capacitor elements wherein each one of the first capacitor elements is individually utilizable for the tank circuit, and a second tuning section comprising second capacitor elements wherein each one of the second capacitor elements is individually utilizable for the tank circuit and the capacitance of each one of the second capacitor elements is continuously adjustable in a predetermined capacitance range in dependence on a tuning voltage. | 12-04-2008 |
20080303602 | Infinite Radio Frequency Spectrum Transceiver - The present invention “Infinite Radio Frequency Spectrum Transceiver” (IRFS for short) relates to a circuit that emits and receives the complete radio frequency spectrum transmission as it exists from 0 hertz to the region where radio frequency ends to j the infrared. Such a circuit causes infinite bandwidth output gain evenly over the entire radio frequency spectrum, can be readily used as a noise source, where such output even gain across the spectrum. Such circuit in its simplest form can be used as a noise source, subsequent use of single circuits organized in series or parallel increase power where they can readily be used as a radio frequency jamming array. Additional insertion into specific points of the circuit can be used to transmit a signal across the bandwidth where such signal takes on the attributes of all frequencies and appears as higher and lower frequency as amplitude gain at such points across the bandwidth. Additional use of various filters can restrict the frequency of transmission. As a receiver signals of all and any kind will show up across the bandwidth viewed on a spectrum analyzer or other analytical instrument to decipher such received signals. As a single component to use in emitting broadband signals for radio frequency beacons. | 12-11-2008 |
20090021318 | AUTOMATIC PAGE DETECTOR - The present invention discloses an automatic page detector, to determine which page of a book is open. The automatic page detector uses a sensor plate and an inductor as a sensor. In the invention, there is a sensor plate at each page of the book and the locations of the sensor plates for different pages are different. There is an array of inductors just beneath the sensor plates when the book is closed. The inductors are connected to the feedback loop of a LC oscillator through analog switches. The proximity of a sensor plate to an inductor will change the frequency of the LC oscillator. Scanning the analog switches by a microprocessor and detecting the variation of frequency of the LC oscillator during each scanning time period, the status of each sensor plate will be detected and we can determine which page of a book is opened. | 01-22-2009 |
20090051453 | VOLTAGE-CONTROLLED OSCILLATOR USING LC RESONATOR - Provided is a voltage-controlled oscillator (VCO) using an LC resonator circuit which includes a first resonance circuit in which two serially connected varactor diodes and an inductor are connected in parallel, a second resonance circuit in which one or more inductor L | 02-26-2009 |
20090072920 | Oscillator and communication system using the same - A transfer impedance from input terminals of a resonator to output terminals of the resonator is larger than a driving-point impedance of the input terminals of the resonator at an oscillation frequency. The input terminals of the resonator are connected with the drain terminals of transistors Q | 03-19-2009 |
20090079509 | LC QUADRATURE OSCILLATOR HAVING PHASE AND AMPLITUDE MISMATCH COMPENSATOR - Embodiments of the invention may provide for an LC quadrature oscillator that includes two LC oscillators that are cross-coupled with each other to generate I/Q clock signals and a phase and amplitude mismatch compensator. The phase and amplitude mismatch detector may include an amplitude mismatch detectors a transconductor, and a capacitor for compensating for both phase and amplitude mismatches between I/Q clock signals generated in the LC quadrature oscillator. | 03-26-2009 |
20090115540 | CONTROLLABLE OSCILLATING SYSTEM AND RELATED METHOD FOR SELECTIVELY ADJUSTING CURRENTS PASSING THROUGH CROSS-COUPLING DRIVING DEVICE - A controllable oscillating system for generating a differential oscillating signal is disclosed. The controllable oscillating system includes an oscillating circuit and a current adjusting device. The oscillating circuit includes a controllable resonator, a cross-coupling driving device, and a current source. The cross-coupling driving device is coupled to the controllable resonator and utilized for driving the controllable resonator to generate the differential oscillating signal. The current source is coupled to the cross-coupling driving device and utilized for providing a first current. The current adjusting device is coupled to the cross-coupling driving device and utilized for adjusting currents passing through the cross-coupling driving device. | 05-07-2009 |
20090146751 | Clock, Frequency Reference, and Other Reference Signal Generator - Exemplary embodiments of the invention provide a reference signal generator, system and method. An exemplary apparatus to generate a harmonic reference signal includes a reference resonator, such as an LC-tank, and a frequency controller. The reference resonator generates a first reference signal having a resonant frequency, and the frequency controller maintains substantially constant a magnitude of a peak amplitude of the first reference signal and maintains substantially constant a common mode voltage level of the reference resonator. A temperature-dependent control voltage is also generated and utilized to maintain the resonant frequency substantially constant or within a predetermined variance of a calibrated or selected frequency. | 06-11-2009 |
20090189704 | Voltage controlled oscillator with multi-tap inductor - According to one exemplary embodiment, a voltage controlled oscillator configured to operate in low and high band modes includes a low band section and a high band section. The voltage controlled oscillator further includes a multi-tap inductor having a high inductance portion coupled to the low band section and a low inductance portion coupled to the high band section. The low band section is configured to provide a low frequency band oscillator output in the low band mode and the high band section is configure to provide a high frequency band oscillator output in the high band mode. The low band section is disabled in the high band mode and the high band section is disabled in the low band mode. A center tap of the multi-tap inductor is coupled to a supply voltage. | 07-30-2009 |
20090201097 | CONTINUOUSLY TUNABLE INDUCTOR AND METHOD TO CONTINUOUSLY TUNE AN INDUCTOR - A continuously tunable inductor with an inductive-capacitive (LC) voltage controlled oscillator (VCO) having a primary coil. The inductor includes a separate isolated secondary coil, a set of transistors composing a closed loop with the secondary coil, a magnetic coupling between the primary coil of the LC VCO and the secondary coil, an electrical coupling between the LC VCO and the set of transistors composing a closed loop with the secondary coil, and means for electric current injection into the closed loop. Such an inductor can be tuned by modulating a mutual inductance, which is magnetically and electrically coupled with the LC VCO by injection of an electric current (I | 08-13-2009 |
20090231051 | OSCILLATOR FOR CONTROLLING VOLTAGE - The present invention relates to a resonance type voltage control oscillator. The voltage control oscillator includes an inductor unit including two inductances serially coupled to each other, a variable capacitance unit coupled to the inductor unit in parallel, a negative resistance unit coupled to the inductor unit in parallel, a first variable resistor having a resistance value corresponding to an input first control signal, a second variable resistor having a resistance value corresponding to an input second control signal, and a variable resistor control circuit unit generating the first and second control signals and controlling respective resistance values of the first and second variable resistors. The variable resistor control circuit unit controls the respective resistance values of the first and second variable resistors to set current flowing in the inductor unit, the variable capacitance unit and the negative resistance unit to a desired current value. | 09-17-2009 |
20090295492 | BIASED VARACTOR NETWORKS AND METHODS TO USE THE SAME - Example biased varactor networks and methods to use the same are disclosed. A disclosed example apparatus includes a bias voltage generator to generate a first bias voltage and a second bias voltage, the second bias voltage selected to be different from the first bias voltage, and a varactor network comprising first and second varactors connected to receive a control voltage, the control voltage configurable to control a capacitance of the varactor network, the capacitance of the varactor network comprising a first capacitance of the first varactor determined by a first difference between the control voltage and the first bias voltage and a second capacitance of the second varactor determined by a second difference between the control voltage and the second bias voltage. | 12-03-2009 |
20100001805 | High-frequency voltage-controlled oscillation circuit - A high-frequency voltage-Controlled oscillation circuit which does not oscillate abnormally, is improved in phase noise, and has a small circuit scale. A phase shift circuit composed of third or more order odd π low-Pass filter and capacitive variable-reactance elements (D | 01-07-2010 |
20100013568 | SEMICONDUCTOR DEVICE, RF-IC AND MANUFACTURING METHOD OF THE SAME - Provided is a technology capable of reducing parasitic capacitance of a capacitor while reducing the space occupied by the capacitor. A stacked structure is obtained by forming, over a capacitor composed of a lower electrode, a capacitor insulating film and an intermediate electrode, another capacitor composed of the intermediate electrode, another capacitor insulating film and an upper electrode. Since the intermediate electrode has a step difference, each of the distance between the intermediate electrode and lower electrode and the distance between the intermediate electrode and upper electrode in a region other than the capacitor formation region becomes greater than that in the capacitor formation region. For example, the lower electrode is brought into direct contact with the capacitor insulating film in the capacitor formation region, while the lower electrode is not brought into direct contact with the capacitor insulating film in the region other than the capacitor formation region. | 01-21-2010 |
20100073100 | METHOD AND ARRANGEMENT FOR A VOLTAGE CONTROLLED OSCILLATOR CIRCUIT - In a voltage controlled oscillator circuit comprising two transistors, the first terminals of each said two transistors, are coupled together and to a supply voltage, two interconnected resonator units, and each of said two resonator units couples a respective second terminal of said two transistors to third terminals of both said transistors. | 03-25-2010 |
20100156548 | High-frequency colpitts circuit - A high-frequency Colpitts circuit having a feedback transistor Q | 06-24-2010 |
20100188160 | OSCILLATOR ARRANGEMENT - The present invention relates to an oscillator arrangement, arranged for providing an oscillator output and phase noise detection and/or control of said oscillator output, the arrangement comprising a mixer ( | 07-29-2010 |
20100219896 | Quadrature Oscillator With High Linearity - The present invention relates to an oscillator circuit and a method of controlling the oscillation frequency of an in-phase signal and a quadrature signal. First oscillator means ( | 09-02-2010 |
20100237957 | DIFFERENTIAL OSCILLATION APPARATUS AND MODULATOR - It is an object of the present invention to shorten a time required until phases of output signals being output from two output terminals are inverted respectively from a start time of an oscillation in a differential oscillation apparatus. In a differential oscillation apparatus according to the present invention which includes a differential oscillator portion | 09-23-2010 |
20100277250 | Voltage controlled oscillator - A voltage controlled oscillator (VCO) includes a first and a second n-type transistor, a first and a second p-type transistor, a first and second capacitive element, a bridge connecting (1) the ground-facing connection of the first n-type transistor and power-facing connection of the first p-type transistor to (2) the ground-facing connection of the second n-type transistor and power-facing connection of the second p-type transistor, a first inductive element, a first capacitor bank, a second inductive element, and a second capacitor bank. | 11-04-2010 |
20100289592 | GM-BOOSTED DIFFERENTIAL DRAIN-TO-SOURCE FEEDBACK COLPITTS VOLTAGE CONTROLLED OSCILLATOR - A voltage controlled oscillator outputting a differential signal includes: an inductor connected to a first power supply supplying first voltage; first and second transistors for differential switching; first and second variable capacitors connected to the inductor in parallel; a third transistor of which a gate electrode is connected to a first node; and a fourth transistor of which a gate electrode is connected to a second node. When bias voltage is applied to the gate electrode of the first transistor to be turned on, negative resistance is generated by voltage applied to the first capacitor and the second capacitor through the first transistor. When voltage outputted through the first node is applied to the gate electrode of the third transistor to be turned on, the voltage is additionally applied to the first capacitor and the second capacitor by the third transistor to increase the negative resistance. | 11-18-2010 |
20100308929 | Low-noise voltage-controlled oscillating circuit - A low noise voltage-controlled oscillating circuit which can remove a power source noise to improve low frequency noise characteristics is disclosed. A capacitor C | 12-09-2010 |
20110032045 | OSCILLATOR CIRCUIT - The invention relates to an oscillator circuit comprising: a VCO core having an output terminal for providing an oscillatory output signal thereat and having a supply terminal for receiving a supply voltage from a voltage supply, a subsequent circuit coupled to the VCO core's output terminal and having a supply terminal for receiving a supply voltage from the voltage supply. According to the invention, a decoupling member is arranged between the VCO core's supply terminal and the subsequent circuit's supply terminal for preventing high-frequency signals generated by the subsequent circuit at its supply terminal from entering the VCO core. The decoupling member may comprise a transmission line the length of which is one quarter wavelength associated with a second-harmonic oscillation. | 02-10-2011 |
20110080222 | Voltage controlled oscillator - There is provided a voltage controlled oscillator using a Colpitts circuit capable of suppressing deterioration (decrease) in variable range (adjustable range) of an output frequency due to the influence of an inductance component on a conductive line, which connects a connection point between two capacitors of a feedback part and an emitter of a transistor. In a VCO using a Colpitts circuit, with respect to capacitors | 04-07-2011 |
20110080223 | Voltage controlled oscillator - There is provided a voltage controlled oscillator that is compact and can be manufactured at low cost. The voltage controlled oscillator is structured to include: a resonance part including a variable capacitance element and an inductance element, the variable capacitance element having a capacitance that varies according to a control voltage for frequency control input from an external part, and a series resonant frequency of the resonance part being adjusted according to the capacitance; an amplifying part amplifying a frequency signal from the resonance part; and a feedback part including a capacitance element for feedback and feeding the frequency signal amplified by the amplifying part back to the resonance part to form an oscillation loop together with the amplifying part and the resonance part, wherein the amplifying part is provided in an integrated circuit chip, and the resonance part and the capacitance element for feedback are formed as circuit components separate from the integrated circuit chip. The circuit components are selected according to an oscillation frequency. | 04-07-2011 |
20110267149 | SWITCHED CAPACITOR CIRCUIT FOR A VOLTAGE CONTROLLED OSCILLATOR - A switched capacitor circuit for use at at least one operating frequency is provided. The switched capacitor may include an inductive element having a first terminal coupled to a switching voltage and a second terminal. The switched capacitor circuit may further include a hetero-junction bipolar transistor (HBT) having a base terminal coupled to the second terminal of the inductive element, a first conducting terminal, and a second conducting terminal coupled to a voltage supply terminal. The switched capacitor circuit may further include a capacitor having a first terminal coupled to the first conducting terminal of the HBT and a second terminal coupled to a node, wherein a capacitance value at the node is a function of the switching voltage, and wherein the inductive element is configured such that a combined impedance of an impedance of the capacitor, an impedance of the HBT, and an impedance of inductive element resonates at the at least one operating frequency only when the HBT is substantially non-conducting. | 11-03-2011 |
20120068777 | APPARATUS AND METHOD FOR FREQUENCY GENERATION - A wideband frequency generator has two or more oscillators for different frequency bands, disposed on the same die within a flip chip package. Coupling between inductors of the two oscillators is reduced by placing one inductor on the die and the other inductor on the package, separating the inductors by a solder bump diameter. The loosely coupled inductors allow manipulation of the LC tank circuit of one of the oscillators to increase the bandwidth of the other oscillator, and vice versa. Preventing undesirable mode of oscillation in one of the oscillators may be achieved by loading the LC tank circuit of the other oscillator with a large capacitance, such as the entire capacitance of the coarse tuning bank of the other oscillator. Preventing the undesirable mode may also be achieved by decreasing the quality factor of the other oscillator's LC tank and thereby increasing the losses in the tank circuit. | 03-22-2012 |
20120092081 | TUNABLE RESONANT CIRCUIT IN AN INTEGRATED CIRCUIT - A tunable resonant circuit includes first and second capacitors that provide a matched capacitance between first and second electrodes of the first and second capacitors. A deep-well arrangement includes a first well disposed within a second well in a substrate. The first and second capacitors are each disposed on the first well. Two channel electrodes of a first transistor are respectively coupled to the second electrode of the first capacitor and the second electrode of the second capacitor. Two channel electrodes of a second transistor are respectively coupled to the second electrode of the first capacitor and to ground. Two channel electrodes of the third transistor are respectively coupled to the second electrode of the second capacitor and to ground. The gate electrodes of the first, second, and third transistors are responsive to a tuning signal, and an inductor is coupled between the first electrodes of the first and second capacitors. | 04-19-2012 |
20120112845 | Circuit Arrangement For Inductive Energy Transfer - A circuit arrangement for the inductive transfer of energy is disclosed. The circuit arrangement includes an oscillator; and a device for detecting the load of the oscillator and for setting the circuit arrangement into one of multiple operating states depending on the detected load. The device determines the load of the oscillator using an electrical variable occurring in the oscillator. | 05-10-2012 |
20120169429 | CIRCUIT ARRANGEMENT FOR CREATING MICROWAVE OSCILLATIONS - An electronic oscillator of a circuit arrangement for creating microwave oscillations with two transistors as amplifier elements and with a resonator ( | 07-05-2012 |
20120235758 | VOLTAGE-CONTROLLED OSCILLATORS AND RELATED SYSTEMS - Apparatus are provided for voltage-controlled oscillators and related systems. An exemplary voltage-controlled oscillator includes an active-circuit arrangement that facilitates generation of an oscillating signal, and a resonator arrangement capacitively coupled to the active-circuit arrangement to influence an oscillation frequency of the oscillating signal based on a difference between a first control voltage and a second control voltage. | 09-20-2012 |
20120235759 | VOLTAGE CONTROLLED OSCILLATOR CIRCUITS AND METHODS USING VARIABLE CAPACITANCE DEGENERATION FOR INCREASED TUNING RANGE - Voltage controlled oscillator circuits are provided in which variable capacitance degeneration is employed to provide increased tuning ranges and output amplitudes for VCO circuits for millimeter wave applications. | 09-20-2012 |
20120268221 | SYNCHRONIZED ARRAY POWER OSCILLATOR WITH LEG INDUCTORS - An electronic high frequency induction heater driver, for a variable spray fuel injection system, uses a scalable array of zero-voltage switching oscillators that utilize full and half-bridge topology with inductors between semiconductor switches wherein the semiconductor switches are synchronous within each bridge for function, and each bridge is synchronized for function along the entire array. The induction heater driver, upon receipt of a turn-on signal, multiplies a supply voltage through a self-oscillating series resonance, wherein one component of each tank resonator circuit comprises an induction heater coil magnetically coupled to an appropriate loss component so that fuel inside a fuel component is heated to a desired temperature. | 10-25-2012 |
20130214870 | Robust Injection-Locked Local Oscillator - The present disclosure relates to an injection-locked local oscillator and a method for calibrating the same. The local oscillator includes an active circuit having at least one first resonator connected to the output of the active circuit, and at least one second resonator coupled to the at least one first resonator, thereby forming at least one coupled resonator. In another aspect, the present disclosure relates to a method for calibrating a local oscillator, the calibration being a two-step calibration based mainly on power measurement. | 08-22-2013 |
20130249641 | OSCILLATOR CIRCUIT - The oscillator circuit | 09-26-2013 |
20130285756 | CIRCUIT OF INDUCTANCE/CAPACITANCE (LC) VOLTAGE-CONTROL OSCILLATOR - A circuit of inductance/capacitance (LC) voltage control oscillator (VCO) includes an LC VCO unit, a peak detector and a processing unit. The LC VCO unit receives a current control signal and outputs an oscillating voltage signal. The peak detector receives the oscillating voltage signal to obtain an averaged voltage value. The processing unit receives the averaged voltage value to accordingly output the current control signal and feedback to the LC VCO unit. The processing unit also detects whether or not the averaged voltage value has reached to a saturation state and a corresponding critical current. After the current control signal reaches to the critical current, the current control signal is set within a variance range near the critical current. | 10-31-2013 |
20140028407 | Reconfigurable and Auto-Reconfigurable Resonant Clock - The present disclosure relates to a resonant clock system having a driver component, a clock load capacitor, and a reconfigurable inductor array. The driver component generates a driven input signal. The clock load capacitor is configured to receive the driven input signal. The inductor array is configured to have an effective inductance according to a selected frequency. The inductor array also generates a resonant signal at the selected frequency using the effective inductance. | 01-30-2014 |
20140077890 | CLASS-F CMOS OSCILLATOR - A novel and useful oscillator topology demonstrating an improved phase noise performance that exploits the time-variant phase noise model with insights into the phase noise conversion mechanisms. The oscillator is based on enforcing a pseudo-square voltage waveform around an LC tank by increasing the third-harmonic of the fundamental oscillation voltage through an additional impedance peak. Alternatively, the oscillator is based on enforcing clipped oscillation waveform by increasing the second harmonic of the fundamental oscillation voltage through an additional impedance peak. This auxiliary impedance peak is realized by a transformer with moderately coupled resonating windings. As a result, the effective impulse sensitivity function (ISF) decreases thus reducing the oscillator's effective noise factor such that a significant improvement in the oscillator phase noise and power efficiency are achieved. | 03-20-2014 |
20140159825 | VOLTAGE CONTROLLED OSCILLATOR WITH LOW PHASE NOISE AND HIGH Q INDUCTIVE DEGENERATION - A voltage controlled oscillator (VCO) includes an LC tank circuit coupled between a supply terminal, a first node and a second node. A pair of cross coupled transistors is coupled to the first node and the second node. A degeneration inductor, center tapped to a ground terminal, is coupled to the pair of cross coupled transistors configured to inductively degenerate each of the pair of cross coupled transistors and configured to resonate a source capacitance of each of the pair of cross coupled transistors. The VCO is configured to be having a low phase noise with high quality factor using inductive degeneration. | 06-12-2014 |
20140167867 | Variable Inductor for LC Oscillator - A variable inductor is disclosed. In accordance with some embodiments of the present disclosure, a variable inductor may comprise a single-turn conductor comprising a first inductor terminal, a second inductor terminal, a first base portion extending from the first inductor terminal to a first intersection location, a second base portion extending from the second inductor terminal to a second intersection location, and a switched portion extending from the first intersection location to the second intersection location, and a switch comprising a first conductive terminal coupled to the first intersection location and a second conductive terminal coupled to the second intersection location. | 06-19-2014 |
20140167868 | Power-efficient multi-frequency resonant clock meshes - Power-efficient resonant clock meshes and multiple frequency resonant clock distribution networks. | 06-19-2014 |
20140285273 | SEMICONDUCTOR DEVICE - According to one embodiment, there is provided a semiconductor device including a first capacitance electrode, a second capacitance electrode, and a depletion layer. The first capacitance electrode is buried in a hole via an insulating film. The hole is formed in a semiconductor substrate. The second capacitance electrode is formed on a front surface side or on a back surface side of the semiconductor substrate so as to be separated from the first capacitance electrode. The depletion layer forming mechanism includes a control electrode, and forms a depletion layer between the first capacitance electrode and the second capacitance electrode. | 09-25-2014 |
20140368286 | Low Noise Voltage Controlled Oscillator - An enhanced negative resistance voltage controlled oscillator (VCO) circuit is provided, in which a parallel connection of a capacitor and a resistor configured to provide frequency-dependent transconductance is present across source nodes of a first pair of field effect transistors in which gate nodes and drain nodes are cross-coupled. The source nodes of the first pair of field effect transistors are electrically shorted to drain nodes of a second pair of field effect transistors of which the gate nodes are electrically shorted to the gate nodes of the first pair of field effect transistors. The parallel connection of the capacitor and the resistor includes a parallel connection of a capacitor and a resistor such that the net transconductance of the first pair of field effect transistors is less at low frequencies where thermal noise and flicker noise are dominant part of the phase noise than at the operational frequency range. | 12-18-2014 |
20150091663 | System and Method for a Voltage Controlled Oscillator - In accordance with an embodiment, a voltage controlled oscillator (VCO) includes a VCO core having a plurality of transistors, a bias resistor coupled between collector terminals of the VCO core and a first supply node, and a varactor circuit coupled to emitter terminals of the VCO core. The bias resistor is configured to limit a self-bias condition of the VCO core. | 04-02-2015 |
20150145612 | ULTRA-LOW VOLTAGE-CONTROLLED OSCILLATOR WITH TRIFILAR COUPLING - The present disclosure relates to a device and method to reduce voltage headroom within a voltage-controlled oscillator by utilizing trifilar coupling or transformer feedback with a capacitive coupling technique. In some embodiments of trifilar coupling, a VCO comprises cross-coupled single-ended oscillators, wherein the voltage of first gate within a first single-ended oscillator is separated from the voltage of a second drain within a second single-ended oscillator within the cross-coupled pair. A trifilar coupling network is composed of a drain inductive component, a source inductive component, and a gate inductive component for a single-ended oscillator, wherein a coupling between drain inductive components and gate inductive components between single-ended oscillators along with a negative feedback loop within each single-ended oscillator forms a cross-coupled pair of transistors which reduces the drain-to-source voltage headroom to approximately a saturation voltage of a transistor within the cross-coupled pair. Other devices and methods are also disclosed. | 05-28-2015 |
20150333696 | System and Method for a Voltage Controlled Oscillator - In accordance with an embodiment, a voltage controlled oscillator (VCO) includes a VCO core having a plurality of transistors, a bias resistor coupled between collector terminals of the VCO core and a first supply node, and a varactor circuit coupled to emitter terminals of the VCO core. The bias resistor is configured to limit a self-bias condition of the VCO core. | 11-19-2015 |
20150333697 | CIRCUITS AND METHODS FOR INCREASING OUTPUT FREQUENCY OF AN LC OSCILLATOR - Disclosed are circuits and methods for increasing an output frequency of an inductance-capacitance (LC) oscillator. In some embodiments, the LC oscillator can be implemented as a voltage-controlled oscillator (VCO) having differential outputs. When the VCO is implemented on a die, wirebond connections from the outputs to a ground results in an effective inductance that impacts a maximum frequency associated with the VCO. An electrical connection such as a wirebond between the differential outputs yields a reduction in the effective inductance thereby increasing the maximum frequency. In some embodiments, the wirebond between the differential outputs can be configured so that its contribution to mutual inductance is reduced or substantially nil. | 11-19-2015 |
20150349712 | RECONFIGURABLE VARACTOR BANK FOR A VOLTAGE-CONTROLLED OSCILLATOR - Aspects of a reconfigurable varactor array for providing a capacitance to control an output frequency of a voltage-controlled oscillator are provided. The reconfigurable varactor array can be configured to provide a configurable capacitance. The reconfigurable varactor array can include a plurality of varactor cells connected in parallel. The reconfigurable varactor array can also include a control circuit configured to receive a control signal to select the configurable capacitance from the reconfigurable varactor array. The control circuit can include a plurality of switch groups. Each switch group can be separately connected to one varactor cell in the reconfigurable varactor array. The control signal from the control circuit can control operation of each switch group. | 12-03-2015 |
20160036382 | LOW POWER WIDE TUNING RANGE OSCILLATOR - A wide tuning range oscillator system uses multiple active cores with cross-coupled transistors and multiple tapped inductors having windings that can be connected to circuit nodes. These active cores are connected to a pair of symmetric tapping points and are switched ON/OFF by biasing elements. Biasing schemes and the topology of the individual cross-coupled cores may be different from each other. The tapping points are symmetrically arranged around the center point of the inductor. One or more of the active cores may be enabled for tuning the center frequency of the oscillator system. | 02-04-2016 |
20160049906 | RESONATOR HAVING DISTRIBUTED TRANSCONDUCTANCE ELEMENTS - A method includes forming a resonator comprising a plurality of switched impedances spatially distributed within the resonator, selecting a resonant frequency for the resonator, and distributing two or more transconductance elements within the resonator based on the selected resonant frequency. Distributing the two or more transconductance elements may include non-uniformly distributing the two or more transconductance elements within the resonator. | 02-18-2016 |
20160079919 | FINE TUNING CONTROL FOR A DIGITALLY CONTROLLED OSCILLATOR - Methods, apparatuses, and systems for providing a variable capacitance using an array of capacitor cells are discussed. In the fine tuning bank of an inductor/capacitor (LC)-tank of a digitally controlled oscillator (DCO), control is implemented by selecting a boundary cell from the array of capacitor cells and having every cell before the boundary cell in a circuit path be grounded and having the boundary cell and every cell after the boundary cell in the circuit path be connected to a voltage source. The circuit path may be the one formed by using thermometer coding in the fine tuning bank. | 03-17-2016 |
20160099678 | VCO, PLL, AND VARACTOR CALIBRATION - In one aspect, a VCO is provided. The VCO includes an inductor, a voltage-controlled capacitive element configured to operate with the inductor to generate an oscillating signal, a voltage supply configured to provide a plurality of voltages to the voltage-controlled capacitive element in a calibration mode, and a control circuit configured to store frequency information indicating frequencies of the oscillating signal in response to the plurality of voltages being provided to the voltage-controlled capacitive element. In another aspect, a PLL is provided. The PLL includes means for selecting, in an open loop configuration, a capacitance of a capacitor based on a target frequency and means for selecting, in a closed loop configuration, an operation voltage of a voltage-controlled capacitive element based on the capacitance of the capacitor. | 04-07-2016 |
20160099680 | Oscillator Circuit - The disclosure provides an oscillator circuit for a voltage controlled oscillator. The oscillator circuit includes first and second coupled transmission lines, wherein the oscillator circuit is configured to provide a variable load impedance at a first end of a signal line of the first transmission line such that a variable inductance is provided between first and second ends of a signal line of the second transmission line in dependence on the variable load impedance. The oscillator circuit is configured to adjust the variable inductance provided between the first and second ends of the signal line of the second transmission line by adjusting the variable load impedance provided at the first end of the signal line of the first transmission line, wherein the variable inductance provided between the first and second ends of the signal line of the second transmission line constitutes a frequency determining element of the oscillator circuit. | 04-07-2016 |
20160203903 | Inductor Layout, and a Voltage-Controlled Oscillator (VCO) System | 07-14-2016 |
20080297266 | Oscillator with Coupled Amplifier - An oscillator including a resonator with at least one first tuneable element, with which a resonant frequency of the resonator can be varied. The oscillator further includes an amplifier, which provides an amplification element, connected to the resonator at a coupling position. The amplifier provides a second tuneable element, by which a complex resistance, which the amplifier provides at the coupling position, is variable in a frequency-dependent manner. | 12-04-2008 |
20140285272 | Computer Aided Fabrication Systems - A technique for implementing an clock tree distribution network having a clock buffer and a plurality of LC tanks that each take into \consideration local capacitance distributions and conductor resistances. An AC-based sizing formulation is applied to the buffer and to the LC tanks so as to reduce the total buffer area. The technique is iterative and can be fully automated while also reducing clock distribution power consumption. | 09-25-2014 |
20080266007 | OSCILLATING APPARATUS HAVING CURRENT COMPENSATING DEVICE FOR PROVIDING COMPENSATING CURRENT TO COMPENSATE FOR CURRENT REDUCTION OF TRANSCONDUCTIVE DEVICE AND METHOD THEREOF - According to an embodiment of the present invention, an oscillating apparatus is provided. The oscillating apparatus generates an oscillating signal, and the oscillating apparatus includes a resonating device, a transconductive device, a biasing device, and a current compensating device. The resonating device generates the oscillating signal; the transconductive device is coupled to the resonating device for providing the resonating device with a positive feedback loop; the biasing device is coupled to the transconductive device for providing the transconductive device with a biasing current; and the current compensating device is coupled between the resonating device and the biasing device for providing the biasing device with a compensating current to compensate for a current reduction of the transconductive device. | 10-30-2008 |
20080284534 | OSCILLATOR - An oscillator is provided that includes a plurality of excitation units for providing an excitation signal and a tank as an oscillation generating unit for generating an oscillation signal in response to the excitation signal, whereby the tank has terminals for providing the oscillator signal, whereby each excitation unit has at least one inductor, whereby the tank is coupled magnetically to the at least one inductor of each excitation unit, and whereby the excitation signal can be transmitted between the excitation units and the tank by means of the magnetic coupling. | 11-20-2008 |
20080290957 | RECEIVER WITH COLPITTS DIFFERENTIAL OSCILLATOR, COLPITTS QUADRATURE OSCILLATOR, AND COMMON-GATE LOW NOISE AMPLIFIER - Embodiments of the present invention include a common-gate amplifier having an input terminal and an output terminal, a transistor having a source, a drain, and a gate, four inductors, and two capacitors, and a negative amplification circuitry. The negative amplification circuitry has an input terminal to receive an RF signal. The negative amplification circuitry applies negative or zero amplification to the RF signal and outputs the negative or zero amplified signal on an output terminal. Alternative embodiments include a Colpitts differential oscillator, which includes two Colpitts single-ended oscillators. Each Colpitts single-ended oscillator includes a transistor. The source of the transistor in one Colpitts single-ended oscillator may be capacitively coupled to the gate of the transistor in the other Colpitts single-ended oscillator. | 11-27-2008 |
20080309423 | VOLTAGE CONTROL OSCILLATOR AND OSCILLATION CONTROL SYSTEM - A voltage control oscillator has a first MOS transistor having one end connected to a first potential; a second MOS transistor having one end connected to the first potential, a gate connected to an other end of the first MOS transistor, and an other end connected to a gate of the first MOS transistor; a first varactor having one end connected to the other end of the first MOS transistor, an other end connected to the other end of the second MOS transistor, and a capacitance changing with a first control voltage; a first inductor having one end connected to the one end of the first varactor; a second inductor having one end connected to the other end of the first varactor; a second varactor having one end connected to an other end of the first inductor, an other end connected to an other end of the second inductor, and a capacitance changing with a second control voltage; a third inductor connected between the one end of the second varactor and a second potential; and a fourth inductor connected between the other end of the second varactor and the second potential. | 12-18-2008 |
20090015343 | Voltage Controlled Oscillator (VCO) With Simultaneous Switching Of Frequency Band, Oscillation Core And Varactor Size - The invention relates to a voltage controlled oscillator for generating a variable frequency. The oscillator comprises an oscillator core and a transconductive portion for compensating current losses in the oscillator core. The oscillator core comprises an inductive portion with at least one inductive element and a capacitive portion whose capacitance can be continuously varied by means of a control voltage for varying said frequency. The capacitive portion comprises multiple variable capacitive elements whose capacitance is continuously variable by means of said control voltage, each variable capacitive element being switchable for being added to or removed from the capacitive portion. | 01-15-2009 |
20090021317 | CMOS cross-coupled differential voltage controlled oscillator - A CMOS cross-coupled differential voltage controlled oscillator is provided with a pair of oscillator outputs. The oscillator includes a current control unit, a first cross-coupled differential pair, an inductor unit, a capacitor unit, a second cross-coupled differential pair and a voltage controller. The current control unit is coupled between a relatively-high voltage and a relatively-low voltage. The first cross-coupled differential pair, the inductor unit, the capacitor unit and the second cross-coupled differential pair are coupled between the pair of oscillator outputs. According to the present invention, the inductor unit is provided with a midway node. The voltage controller is coupled and powered by the midway node. | 01-22-2009 |
20090066431 | WIDE-BAND VOLTAGE CONTROLLED OSCILLATOR - A wide-band voltage controlled oscillator includes a cross-connected transistors for providing a stable oscillating signal, an inductor unit for providing an inductance for determining a resonance frequency, a varactor bank including a plurality of switchable variable-capacitance elements parallely connected to the inductor unit and having a varactor capacitance varying with the first switching signal and a tuning voltage, a subsection capacitor bank including a plurality of switchable capacitor elements parallely connected to the inductor unit and having predetermined capacitances for grouping frequency sections, and a binary-weighted capacitor bank including a plurality of binary-weighted capacitor arrays parallely connected to the inductor unit and a bank selector for selecting one of the binary-weighted capacitor arrays, wherein each binary-weighted capacitor arrays includes a plurality of parallely connected switchable capacitor elements selectively switched on by a third switching signal to determine a variable weighted capacitance of the tunable binary-weighted capacitor bank. | 03-12-2009 |
20090072919 | VOLTAGE-CONTROLLED OSCILLATOR WITH WIDE OSCILLATION FREQUENCY RANGE AND LINEAR CHARACTERISTICS - Provided is a voltage-controlled oscillator with a wide oscillation frequency range and linear characteristics, which can linearly change an oscillation frequency versus control voltage due to a variable capacitance range increased by several MOS transistors additionally connected to an LC resonant circuit, and can control the oscillation frequency range by adjusting numbers, widths, lengths and operation regions of the MOS transistors. Thus, the voltage-controlled oscillator with a wide oscillation frequency range and linear control voltage-oscillation frequency characteristics without using a switching device can be implemented. | 03-19-2009 |
20090085682 | Injection-locked frequency divider with a wide injection-locked frequency range - An injection-locked frequency divider includes a signal injection circuit and colpitts VCO. The signal injection circuit is for injecting an injection signal. The colpitts VCO includes first and second transistors, first and second LC tank circuits and a cross-coupled transistor pair. The first terminals of the first and second transistors receive the injection signal. The first and second LC tank circuits are for determining resonance frequency of an oscillation signal of the colpitts VCO. The cross-coupled transistor pair includes third and fourth transistors. The control terminals of the third and fourth transistors are respectively coupled to first terminals of the fourth and third transistors. The first terminals of the third and fourth transistors are respectively coupled to a first terminal or control terminal of the first and second transistors for providing an equivalent negative resistance. The injection signal and oscillation signal are mixed in frequency to generate differential output signals. | 04-02-2009 |
20090108947 | Voltage Controlled Oscillator - A voltage controlled oscillator includes an LC-tank circuit, a cross-coupled pair circuit, and a trans-conductance adjusting circuit. The LC-tank circuit provides an inductance and a capacitance. The cross-coupled pair circuit is coupled to the LC-tank circuit and has a first transistor and a second transistor in a cross-coupled manner. The trans-conductance adjusting circuit is utilized for adjusting a trans-conductance value of the voltage controlled oscillator according to a first control signal, which includes a third transistor coupled to the first transistor and a first switch unit, and a forth transistor coupled to the second transistor and the first switch unit. The first control signal is used for controlling whether to turn on the first switch unit so as to adjust the trans-conductance value of the voltage controlled oscillator. | 04-30-2009 |
20090128244 | TRANSISTOR VOLTAGE CONTROLLED OSCILLATOR - A FET transistor voltage-controlled oscillator is provided that includes a crossed-coupled inductor capacitor tank (LC-Tank) transistor voltage-controlled circuit having a first transistor and a second transistor, as well as a transistor frequency multiplying circuit having a third transistor and a fourth transistor. In the design, the gate of the first transistor is connected to the drain of the second transistor, and the gate of the second transistor is connected to the drain of the first transistor. Then, the source of the third transistor is connected to the source of the first transistor, and the source of the fourth transistor is connected to the source of the second transistor. Last, the gate of the third transistor is connected to the gate of the fourth transistor, and the drain of the third transistor is connected to the drain of the fourth transistor. Therefore, the parasitic capacitance present in the first transistor and the parasitic capacitance present in the second transistor generate an effect similar to two capacitors connected in series, via the transistor frequency multiplying circuit. The effect reduces the total capacitance of the voltage-controlled oscillator, to increase the working frequency of the voltage-controlled circuit and allow a circuit having the voltage-controlled circuit to operate at a high frequency. | 05-21-2009 |
20090128245 | Oscillator Circuit - The present invention relates to an oscillator circuit having a resonant element, an active element, a feedback loop, and an additional loop comprising a phase shifting element. | 05-21-2009 |
20090184774 | TRANSISTOR VOLTAGE-CONTROLLED OSCILLATOR - A transistor voltage-controlled oscillator includes a cross-coupled LC-tank transistor voltage-controlled oscillating circuit composed of two transistors, a capacitor set, and a first transformer inductor having a first inductor coil and a second inductor coil coupled to the first inductor coil; and a second transformer inductor having a third inductor coil and a fourth inductor coil coupled to the third inductor coil. The first transformer inductor and the second transformer inductor are both used as a coupling inductor for the cross-coupled LC-tank transistor voltage-controlled oscillating circuit. As a result, the inductor area of the transistor voltage-controlled oscillator is greatly reduced and the parasitic capacitance between the inductors and the silicon substrate is reduced accordingly such that the power consumption is greatly reduced and the quality factor of the inductor is increased. | 07-23-2009 |
20090251228 | VOLTAGE-CONTROLLED VARIABLE FREQUENCY OSCILLATION CIRCUIT AND SIGNAL PROCESSING CIRCUIT - A voltage-controlled variable frequency oscillation circuit, includes: an oscillation circuit section including a resonance circuit which includes a coil and a variable capacitance element, and a negative resistance circuit; and a first resistor connected between the oscillation circuit section and a first one of a pair of terminals of a power supply. | 10-08-2009 |
20090256643 | VOLTAGE CONTROLLED OSCILLATOR, AND PLL CIRCUIT AND RADIO COMMUNICATION DEVICE EACH INCLUDING THE SAME - A voltage controlled oscillator of the present invention includes an inductor circuit | 10-15-2009 |
20090289731 | RESONATOR CIRCUIT AND VOLTAGE-CONTROLLED OSCILLATOR USING THE SAME - A resonator circuit applied to a voltage-controlled oscillator comprises a switch and a wiring inductance. The switch is connected to a first node and a third node. The wiring inductance has multiple circles, and circles a center from an outermost node to an innermost node through an intermediate node. The outermost node is connected to the first node, the intermediate node is connected to the third node, and the innermost node is connected to the second node. | 11-26-2009 |
20090289732 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND FREQUENCY SYNTHESIZER - A semiconductor integrated circuit includes: a resonance circuit configured to determine an oscillation frequency; a first MOS transistor connected to the resonance circuit and configured to constitute an oscillation unit for delivering an oscillation output having the oscillation frequency; a second MOS transistor connected in parallel with the first MOS transistor; and a control unit configured to turn on and off the second MOS transistor according to the oscillation frequency, thereby enabling an equivalent gate width based on the first and second MOS transistors to be increased and decreased. Consequently, there is obtained an oscillation output having reduced phase noise, while an adequate oscillation margin is maintained. | 11-26-2009 |
20090315631 | Methods and Apparatus Utilizing Quantum Inductance of Nanoscale Structures - Methods and apparatus utilizing the quantum inductance of one-dimensional (ID) nanoscale structures (e.g., nanowires, carbon nanotubes). In one exemplary circuit implementation, all elements of a high-frequency circuit path are constituted by nanoscale structures without significant intervening structures (e.g., metal contacts) that would introduce undesirable resistance in the high-frequency circuit path. In this manner, the deleterious effects of contact resistance (e.g., metal-to-nanostructure interfaces) on the quality factor associated with the quantum inductance, and ultimately operation of the circuit, may be significantly reduced or avoided. | 12-24-2009 |
20090322436 | VOLTAGE-CONTROLLED OSCILLATOR - A voltage-controlled oscillator comprises an inductor and a group of variable capacitance elements forming a resonance circuit. The group of variable capacitance elements includes first and second variable capacitance elements connectable in parallel and having mutually different absolute values of a ratio of control-voltage sensitivity to capacitance. The first and second variable capacitance elements both have a first end supplied with a control voltage for controlling resonance frequency of the resonance circuit and have a second end selectively connected to the inductor by a band selection signal for deciding a band in which the resonance frequency exists. | 12-31-2009 |
20100007427 | SWITCHING CAPACITOR GENERATION CIRCUIT - A switching capacitor generation circuit which reduces the on-resistance and parasitic capacitance of a switch element and improves the operation properties of the switch element. The switching capacitor generation circuit, which has first and second output terminals, includes a first capacitor coupled to the first output terminal, a second capacitor coupled to the second output terminal, and a single switch element coupled between the first and the second capacitors. | 01-14-2010 |
20100013567 | SWITCHING CAPACITOR GENERATION CIRCUIT - A switching capacitor generation circuit which reduces the on-resistance and parasitic capacitance of a switch element and improves the operation properties of the switch element. The switching capacitor generation circuit, which has first and second output terminals, includes a first capacitor coupled to the first output terminal, a second capacitor coupled to the second output terminal, and a single switch element coupled between the first and the second capacitors. | 01-21-2010 |
20100033258 | Secondary vibration damping type crystal oscillator circuit - A secondary vibration damping type crystal oscillator circuit is formed as a Colpitts type, in which a crystal unit is connected between base and collector terminals, a first capacitor is connected between emitter and collector terminals, and a second capacitor is connected between emitter and base terminals of a oscillating transistor. A region between the emitter and collector terminals or between the emitter and base terminals includes a reactance parallel circuit, in which an LC series circuit is connected in parallel to the first or second capacitor. The reactance parallel circuit has resonant characteristics that the reactance parallel circuit is made capacitive at an oscillating frequency in principal vibration mode of the crystal unit as an oscillating frequency, and a resonant frequency of the LC series circuit corresponds to the vibrational frequency in secondary vibration mode that is close to the principal vibration mode. | 02-11-2010 |
20100033259 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - A semiconductor integrated circuit device includes a plurality of first gates each of which has a first protrusion section protruding from a first active region; a plurality of second gates each of which has a second protrusion section protruding from a second active region adjacent to the first active region in a direction opposite to a protruding direction of the first protrusion section; a second common interconnect which is formed on the first protrusion section of the plurality of first gates and on all drains of the second active region and connects the plurality of first gates and all drains of the second active region; and a third common interconnect which is formed on the second protrusion section of the plurality of second gates and on all drains of the first active region and connects the plurality of second gates and all drains of the first active region. | 02-11-2010 |
20100060370 | VOLTAGE-CONTROLLED OSCILLATOR - A voltage-controlled oscillator comprises a variable inductor, a negative impedance circuit, an operating voltage source and a ground point. The variable inductor comprises a transformer and a transistor switch, the transformer comprising a primary side coil and a secondary side coil, the primary side coil comprising a first coil and a second coil, and the secondary side coil comprising a third coil and a fourth coil. The transistor switch is connected in parallel with the primary side coil to adjust an inductance value of the variable inductor based on a gate voltage. The negative impedance circuit is connected in parallel with the secondary side coil to compensate the power consumption of the voltage-controlled oscillator during oscillation. The operating voltage source is electrically connected between the third coil and the fourth coil, and the ground point is electrically connected between the first coil and the second coil. | 03-11-2010 |
20100117749 | Inductance Enhanced Rotary Traveling Wave Oscillator Circuit And Method - An inductance enhanced rotary traveling wave oscillator is disclosed. Portions of the transmission line conductors are increased in length and run in parallel. Because the currents in these portions travel in the same direction, the inductance of these inductors is increased. By controlling the length of the transmission line conductors in these areas compared to the lengths in which the currents travel in opposite directions, the overall impedance of the oscillator can be increased. Increased impedance leads to lower power, higher Q, and lower phase noise for the oscillator. Additionally, the folded nature of the transmission line conductors permits a longer length of transmission line conductors to be routed in a smaller area. The folded nature also permits placement of the devices to take into account their switching delays. A folded circular version of the oscillator is possible, leading to improved access to phase taps on the oscillator. | 05-13-2010 |
20100134195 | CAPACITOR HAVING VARIABLE CAPACITANCE AND DIGITALLY CONTROLLED OSCILLATOR INCLUDING THE SAME - There is provided a capacitor having variable capacitance, which forms different capacitances according to a control signal by applying a switch to a metal-oxide-metal (MOM) structure plate capacitor using a CMOS process. The capacitor includes a stack structure including a plurality of metal layers including a first metal layer, and a plurality of dielectric layers respectively interposed between the plurality of metal layers, and a switch part including at least one switch having one side connected to at least one metal layer among the plurality of metal layers other than the first metal layer. The first metal layer and the other side of the switch serve as both terminals of the capacitor, and at least two capacitances are provided between both terminals of the capacitor upon controlling a short/open of the switch. | 06-03-2010 |
20100188159 | OSCILLATOR CIRCUIT - There is provided an oscillator circuit including: a current source; a resonant unit; an oscillation amplification unit connected to the current source while being connected in parallel to the resonant unit; a feedback resistor connected in parallel to the oscillation amplification unit; a bypass resistor having a resistance lower than a resistance of the feedback resistor; a switch unit connected between the feedback resistor and the bypass resistor, and configured to switch to the feedback resistor or the bypass resistor; and a control unit configured to control the switch unit such that a current from the current source is bypassed to the bypass resistor during a predetermined oscillation starting period, and to control the switch unit such that the current from the current source flows to the feedback resistor after the predetermined oscillation starting period has ended. | 07-29-2010 |
20100194485 | INTEGRATED VOLTAGE-CONTROLLED OSCILLATOR CIRCUITS - Techniques for providing voltage-controlled oscillator circuits having improved phase noise performance and lower power consumption. In an exemplary embodiment, a voltage controlled oscillator (VCO) is coupled to a mixer or a frequency divider such as a divide-by-two circuit. The VCO includes a transistor pair with magnetically cross-coupled inductors, and variable capacitance coupled to the gates of the transistor pair. In an exemplary embodiment, a frequency divider is configured to divide the frequency of the differential current flowing through the transistor pair to generate the LO output. In an alternative exemplary embodiment, a mixer is configured to mix the differential current flowing through the transistor pair with another signal. The VCO and mixer or frequency divider share common bias currents, thereby reducing power consumption. Various exemplary apparatuses and methods utilizing these techniques are disclosed. | 08-05-2010 |
20100207695 | Hartley Voltage Controlled Oscillator - In a Hartley voltage controlled oscillator (VCO) circuit comprising two inductors (L | 08-19-2010 |
20100225407 | Interference resistant local oscillator - With some embodiments, a VCO (voltage controlled oscillator) operates at an integer multiple (N) above a desired transmission frequency. | 09-09-2010 |
20100231313 | SELF-EXCITED OSCILLATION CIRCUIT - A self-excited oscillation circuit of the invention includes a turn-OFF transistor that turns OFF a transistor, a turn-OFF capacitor that outputs a voltage to the base of the turn-OFF transistor, and a bias resistance that charges the turn-OFF capacitor with a voltage in magnitude corresponding to a drain current that flows when the transistor turns ON. A resistance is connected between the turn-OFF capacitor and a power supply portion. Accordingly, charges are accumulated in the turn-OFF capacitor so that the voltage will not drop to or below a bias voltage. It thus becomes possible to make the bias resistance smaller, which can in turn reduce an energy loss at the bias resistance. | 09-16-2010 |
20100244972 | OSCILLATOR CIRCUIT - A first wiring layer and a plurality of second wiring layers having a thickness smaller than the first wiring layer are stacked on the semiconductor substrate. An oscillator circuit has an inductor formed by the plurality of second wiring layers. The inductor oscillates at a frequency at which the inductor and a parasitic capacitance of an inverter circuit resonate. A drain of an n-type MISFET and a drain of a p-type MISFET of the inverter circuit are connected to each other, and an output of the inductor is connected to a connection point of those drains. | 09-30-2010 |
20100264994 | TURNABLE LC OCILLATOR WITH COMMON MODE VOLTAGE ADJUSTMENT - An LC oscillator is provided that achieves improved phase noise performance. A variable frequency oscillator includes a variable supply source (I), an oscillator tank circuit (T), a variable capacitance circuit (VC | 10-21-2010 |
20100264995 | RF Circuits Including Transistors Having Strained Material Layers - Circuits for processing radio frequency (“RF”) and microwave signals are fabricated using field effect transistors (“FETs”) that have one or more strained channel layers disposed on one or more planarized substrate layers. FETs having such a configuration exhibit improved values for, for example, transconductance and noise figure. RF circuits such as, for example, voltage controlled oscillators (“VCOs”), low noise amplifiers (“LNAs”), and phase locked loops (“PLLs”) built using these FETs also exhibit enhanced performance. | 10-21-2010 |
20100271144 | Clock, Frequency Reference, and Other Reference Signal Generator with Frequency Stability Over Temperature Variation - Exemplary embodiments provide a reference signal generator having a reference or center frequency within a predetermined variance over variations in temperature within a specified range. An exemplary apparatus comprises a reference resonator to generate a first reference signal having a resonant frequency, with the reference resonator having a first temperature dependence; and a plurality of switchable circuits, with at least one switchable circuit providing a second temperature dependence opposing the first temperature dependence to maintain the resonant frequency within a predetermined variance over a temperature variation. A wide variety of switchable circuits are disclosed, including a transistor having an on resistance value greater than a nominal resistance, a resistor coupled to a transistor or other switch, and circuit comprising a first reactance coupled to a first switch, with a second reactance coupled to a resistance and a second switch coupled in series to the second reactance or to the resistance. Various coatings may also be applied to an integrated circuit embodiment, such as a silicone coating on a first surface and a metal layer on a second surface. | 10-28-2010 |
20100277249 | CARRIER GENERATOR - A carrier generator for generating a carrier at a frequency of interest in a wireless communications system. The carrier generator comprises a first oscillator configured to generate the carrier. The first oscillator exhibits a first impedance and comprises an energy storage tank, an amplifier, at least one trimming pin and at least one capacitor. The energy storage tank is configured to generate a first periodic signal. The energy storage tank includes at least one inductor and at least one capacitor. The amplifier coupled with the energy storage tank and is configured to amplify an amplitude of the first periodic signal. The at least one trimming pin is configured to adjust the at least one capacitor of the energy storage tank, and the at least one modulation pin is configured to receive a modulation signal. The carrier generator further comprises an antenna exhibiting a second impedance smaller than the first impedance, and a network coupled between the first oscillator and the antenna. The network includes at least one inductor or at least one capacitor and being configured to provide a third impedance such that a resultant impedance of the second impedance and the third impedance as viewed from the first oscillator toward the antenna is large enough to facilitate the first oscillator to generate the carrier at the frequency of interest. | 11-04-2010 |
20100283551 | OVERLAPPING, TWO-SEGMENT CAPACITOR BANK FOR VCO FREQUENCY TUNING - A VCO (for example, in an FM receiver) includes an LC resonant tank. The LC resonant tank includes a coarse tuning capacitor bank and a fine tuning capacitor bank. The coarse tuning capacitor bank contains a plurality of digitally controlled coarse tuning capacitor elements, each providing a first capacitance value when active. The fine tuning capacitor bank contains a plurality of digitally controlled fine tuning capacitor elements, each providing a second capacitance value when active. To address the practical problem of capacitor mismatch, capacitance overlap throughout the VCO tuning range is created by selecting the first and second capacitance values such that the capacitance value of the fine capacitor bank is greater than the first capacitance value when all of the digitally controlled fine tuning capacitor elements of the fine capacitor bank are active. | 11-11-2010 |
20100295625 | Variable inductor - A variable inductor includes: a first inductor having two ends connected to a first terminal and a second terminal; a second inductor having two ends connected to the first terminal and the second terminal; a first node provided on the first inductor; a second node provided on the second inductor; and a switch element that switches between a conductive state and a non-conductive state between the first node and the second node. | 11-25-2010 |
20100295626 | VOLTAGE-CONTROLLED OSCILLATOR ROBUST AGAINST POWER NOISE AND COMMUNICATION APPARATUS USING THE SAME - A voltage-controlled oscillator robust against power supply includes: a regulating unit configured to maintain a virtual power supply of a VCO core circuit in a stable condition with regard to a reference voltage; and a power supply removal unit including second transistors configured to correspond to respective first transistors of the regulating unit, the power supply removal unit being configured to remove power noise of the virtual power supply by using negative feedback through a closed-circuit loop formed by each of the first and second transistors. | 11-25-2010 |
20100295627 | VOLTAGE-CONTROLLED OSCILLATOR - A voltage-controlled oscillator that can achieve low phase noise while ensuring stable oscillation startup and stable oscillation maintenance even under low supply voltage conditions. The voltage-controlled oscillator includes an LC parallel resonant circuit, whose impedance varies with a control input voltage and a negative resistance circuit for introducing negative resistance into the LC parallel resonant circuit, wherein the negative resistance circuit includes at least: a first amplifier circuit, provided in parallel with the LC parallel resonant circuit and having a first pair of transistors cross-coupled via a capacitor, that achieves class-C amplifier operation by biasing the gate of each transistor in the first transistor pair with a first bias voltage; and a similarly configured second amplifier circuit that achieves class-C amplifier operation by biasing the gate of each transistor with a second bias voltage which is different from the first bias voltage. | 11-25-2010 |
20100301955 | Frequency divider using an injection-locking-range enhancement technique - A locking range enhancement technique is described that steers away part of the DC current and reuses it to generate more injected AC current to the injection-locked resonator-based frequency dividers (ILFDs). The injection-enhanced ILFDs maintain the key features of ILFDs, which are high speed and low power consumption, without requiring any extra inductive component and thus extra chip area. | 12-02-2010 |
20100301956 | VOLTAGE-CONTROLLED OSCILLATOR - A voltage-controlled oscillator includes a resonator section in which a plurality of types of variable capacitance elements having different structures and capacitance variation characteristics are connected in parallel and capacitance values of the plurality of types of variable capacitance elements are controlled simultaneously by a control voltage; and an amplifier section for maintaining oscillation produced by the resonator section. Varactor diodes and MOS varactors can be used as the variable capacitance elements. | 12-02-2010 |
20100321124 | CONFIGURABLE WIDE TUNING RANGE OSCILLATOR CORE - An oscillator includes a resonator, a first and a second p-type transistor, and a first and a second n-type transistor. The resonator has a first terminal and a second terminal. The first p-type transistor is switchably connected to the first terminal while the second p-type transistor is switchably connected to the second terminal. A first drain of the first n-type transistor and the second drain of the second n-type transistor are electrically connected to the first terminal and the second terminal, respectively. The oscillator is capable of operating in an NMOS only mode and in a CMOS mode. | 12-23-2010 |
20100327986 | ENHANCING DEVICE RELIABILITY FOR VOLTAGE CONTROLLED OSCILLATOR (VCO) BUFFERS UNDER HIGH VOLTAGE SWING CONDITIONS - A circuit for a voltage controlled oscillator (VCO) buffer is described. The circuit includes a first capacitor connected to an input of the VCO buffer that is connected to a VCO core. The circuit also includes a second capacitor connected to the input of the VCO buffer and the gate of a p-type metal-oxide-semiconductor field effect (PMOS) transistor. The circuit further includes a first switch connected to the first capacitor and the gate of the PMOS transistor. The circuit also includes a third capacitor connected to the input of the VCO buffer. The circuit further includes a fourth capacitor connected to the input of the VCO buffer and the gate of an n-type metal-oxide-semiconductor field effect (NMOS) transistor. The circuit also includes a second switch connected to the third capacitor and the gate of the NMOS transistor. | 12-30-2010 |
20110018646 | LC VOLTAGE-CONTROLLED OSCILLATOR - An LC voltage-controlled oscillator (VCO) is provided. According to the LC voltage-controlled oscillator (VCO), the amplitude of an oscillation signal is improved by increasing the impedance value of an amplifier circuit seen from an output node in an LC voltage-controlled oscillator (VCO), and phase noise is also improved. | 01-27-2011 |
20110032042 | RESONANT OSCILLATOR WITH OSCILLATION-STARTUP CIRCUITRY - Some embodiments of the present invention provide a system that implements a resonant oscillator circuit. This system includes a first inductor with a constant potential terminal coupled to an input voltage, and a time-varying potential terminal coupled to a first phase output. The system also includes a second inductor with a constant potential terminal coupled to the input voltage, and a time-varying potential terminal coupled to a second phase output. The system additionally includes a first n-type transistor with a source terminal coupled to a base voltage, a drain terminal coupled to the first phase output, and a gate terminal coupled to the second phase output. The system also includes a second n-type transistor with a source terminal coupled to the base voltage, a drain terminal coupled to the second phase output, and a gate terminal coupled to the first phase output. Finally, the system includes a startup circuit configured to commence oscillations in the resonant oscillator circuit by energizing the first inductor before energizing the second inductor. | 02-10-2011 |
20110032043 | RESONANT OSCILLATOR CIRCUIT WITH REDUCED STARTUP TRANSIENTS - Some embodiments of the present invention provide a system that implements a resonant oscillator circuit. This resonant oscillator circuit includes: a first inductor, a second inductor, a first capacitance, and a second capacitance, wherein the first and second inductors are configured to operate with the first and second capacitances to produce resonant oscillations which appear at a first phase output and a second phase output. The system also includes a startup circuit which is configured to start the resonant oscillator circuit in a state where: the first phase output is at a peak voltage; the second phase output is at a base voltage; and currents through the first and second inductors are substantially zero. By starting the resonant oscillator circuit in this state, the oscillations commence without a significant startup transient. | 02-10-2011 |
20110032044 | THE DIFFERENTIAL VCO AND QUADRATURE VCO USING CENTER-TAPPED CROSS-COUPLING OF TRANSFORMER - Provided are a differential voltage-controlled oscillator (VCO) and a quadrature VCO using center-tapped cross-coupling of a transformer. The differential VCO and the quadrature VCO can be driven by low power through a current reuse structure and have an excellent phase noise characteristic by center-tapped cross-coupling through a transformer. Further, variable capacitance units for frequency variation are divided into variable capacitance units for coarse tuning and variable capacitance units for fine tuning. Therefore, it is possible to obtain a wide tuning range while voltage oscillation gain is reduced. Further, the differential VCO and the quadrature VCO are configured in such a manner that the respective variable capacitance units operate linearly throughout the entire capacitance region due to control voltage distribution by resistors. Accordingly, it is possible to obtain a linear control voltage-oscillation frequency characteristic. The quadrature VCO according to the present invention can output four-phase quadrature signals while having an excellent phase noise characteristic, without substrate loss and current consumption caused by the switching transistors. | 02-10-2011 |
20110043293 | DeMOS VCO - The present disclosure relates voltage controlled oscillators (VCO) and digitally controlled oscillators (DCO). In one implementation, a VCO is implemented with drain extended MOS transistors (DeMOS). In another implementation, a DCO is implemented with DeMOS devices. | 02-24-2011 |
20110043294 | DeMOS DCO - The present disclosure relates voltage controlled oscillators (VCO) and digitally controlled oscillators (DCO). In one implementation, a VCO is implemented with drain extended MOS transistors (DeMOS). In another implementation, a DCO is implemented with DeMOS devices. | 02-24-2011 |
20110084771 | Low Phase Noise Frequency Synthesizer - Various apparatuses and methods for a low phase noise frequency synthesizer are disclosed herein. For example, some embodiments provide an oscillator that may be used in a low phase noise frequency synthesizer. The oscillator includes a tank circuit, a plurality of cross-coupled transistor pairs connected to the tank circuit, a current source connected to the plurality of cross-coupled transistor pairs, and at least one switch connected to the plurality of cross-coupled transistor pairs. The switch is adapted to activate a subset of the plurality of cross-coupled transistor pairs and to deactivate another subset of the plurality of cross-coupled transistor pairs to operate the tank circuit in the oscillator using the activated subset of the plurality of cross-coupled transistor pairs. | 04-14-2011 |
20110084772 | METHOD FOR SELECTING NATURAL FREQUENCY IN RESONANT CLOCK DISTRIBUTION NETWORKS WITH NO INDUCTOR OVERHEAD - An inductor architecture for resonant clock distribution networks is described. This architecture allows for the adjustment of the natural frequency of a resonant clock distribution network, so that it achieves energy-efficient operation at multiple clock frequencies. The proposed architecture exhibits no inductor overheads. Such an architecture is generally applicable to semiconductor devices with multiple clock frequencies, and high-performance and low-power clocking requirements such as microprocessors, ASICs, and SOCs. Moreover, it is applicable to the binning of semiconductor devices according to achievable performance levels. | 04-14-2011 |
20110084773 | ARCHITECTURE FOR SINGLE-STEPPING IN RESONANT CLOCK DISTRIBUTION NETWORKS - A resonant clock distribution network architecture is proposed that is capable of single-step operation through the use of selective control in the resonant clock drivers and the deployment of flip-flops that require the clock to remain stable for a sufficiently long time between any two consecutive state updates. Such a network is generally applicable to semiconductor devices with various clock frequencies, and high-performance and low-power clocking requirements such as microprocessors, ASICs, and SOCs. | 04-14-2011 |
20110084774 | ARCHITECTURE FOR OPERATING RESONANT CLOCK NETWORK IN CONVENTIONAL MODE - An architecture for resonant clock distribution networks is proposed. The proposed architecture allows for the energy-efficient operation of the resonant clock distribution network in conventional mode, so that it meets target specifications for the clock waveform. Such an architecture is generally applicable to semiconductor devices with multiple clock frequencies, and high-performance and low-power clocking requirements such as microprocessors, ASICs, and SOCs. Moreover, it is applicable to at-speed testing and to binning of semiconductor devices according to achievable performance levels. | 04-14-2011 |
20110084775 | RESONANT CLOCK DISTRIBUTION NETWORK ARCHITECTURE FOR TRACKING PARAMETER VARIATIONS IN CONVENTIONAL CLOCK DISTRIBUTION NETWORKS - A resonant clock distribution network architecture is proposed that enables a resonant clock network to track the impact of parameter variations on the insertion delay of a conventional clock distribution network, thus limiting clock skew between the two networks and yielding increased performance. Such a network is generally applicable to semiconductor devices with various clock frequencies, and high-performance and low-power clocking requirements such as microprocessors, ASICs, and SOCs. | 04-14-2011 |
20110090017 | Reduced Phase Noise Multi-Band VCO - Embodiments of a multi-band voltage controlled oscillator (VCO) are provided herein. The multi-band VCO is configured to adjust a frequency of an output signal based on an input signal. The multi-band VCO includes a tank module, an active module, and a control module. The tank module includes a parallel combination of a capacitor and an inductor. The active module includes a pair of cross-coupled transistors that are configured to provide a negative conductance that cancels out a positive conductance associated with the tank module. To improve the phase noise associated with the multi-band VCO, the control module is configured to adjust the body voltage of the cross-coupled transistors. | 04-21-2011 |
20110090018 | ARCHITECTURE FOR ADJUSTING NATURAL FREQUENCY IN RESONANT CLOCK DISTRIBUTION NETWORKS - An inductor architecture for resonant clock distribution networks is proposed. This architecture allows for the adjustment of the natural frequency of a resonant clock distribution network, so that it achieves energy-efficient operation at multiple clock frequencies. The proposed architecture is primarily targeted at the design of integrated inductors and exhibits relatively low area overheads. Such an architecture is generally applicable to semiconductor devices with multiple clock frequencies, and high-performance and low-power clocking requirements such as microprocessors, ASICs, and SOCs. Moreover, it is applicable to the binning of semiconductor devices according to achievable performance levels. | 04-21-2011 |
20110090019 | ARCHITECTURE FOR FREQUENCY-SCALED OPERATION IN RESONANT CLOCK DISTRIBUTION NETWORKS - An architecture for resonant clock distribution networks is proposed. This architecture allows for the energy-efficient operation of a resonant clock distribution network at multiple clock frequencies through the deployment of flip-flops that can be selectively enabled. The proposed architecture is primarily targeted at the design of resonant clock networks with integrated inductors and exhibits no inductor overheads. Such an architecture is generally applicable to semiconductor devices with multiple clock frequencies, and high-performance and low-power clocking requirements such as microprocessors, ASICs, and SOCs. Moreover, it is applicable to the binning of semiconductor devices according to achievable performance levels. | 04-21-2011 |
20110102093 | INTEGRATED OSCILLATOR CIRCUIT HAVING AT LEAST TWO RESONANT CIRCUITS - An integrated oscillator circuit ( | 05-05-2011 |
20110109396 | Resonance type oscillation circuit and semiconductor device - A resonance type oscillation circuit includes an inductance element which is connected between a first terminal and a second terminal, an amplifier circuit which is connected in parallel with the inductance element between the first terminal and the second terminal, and a first capacitance element which is connected between the first terminal and the second terminal. The oscillation circuit further includes a pair of lead-out regions which are provided on the way of one end and the other end of the inductance element, a switch element which is connected between the pair of lead-out regions and provides short-circuit between the pair of lead-out regions when the switch element is on, and a second capacitance element which is connected between the pair of lead-out regions in parallel with the switch element. | 05-12-2011 |
20110133846 | Temperature Invariant Circuit and Method Thereof - A temperature invariant digitally controlled oscillator is disclosed. The digitally controlled oscillator is configured to generate an output clock with stable frequency. The temperature invariant digitally controlled oscillator comprises a digitally controlled oscillator, a temperature sensor, a temperature decision logic circuit, and a temperature conditioner. The digitally controlled signal is provided to adjust the oscillation frequency of the digitally controlled oscillator by changing its capacitances. The stabilization of the silicon temperature is achieved with the temperature sensor, the temperature decision logic circuit, and the temperature conditioner. | 06-09-2011 |
20110148534 | LC VOLTAGE-CONTROLLED OSCILLATOR - An LC voltage-controlled oscillator (VCO) is provided. The LC VCO includes an LC resonant circuit including at least one inductor whose both terminals are connected to output nodes and at least one capacitor connected in parallel with the inductor, and an amplifier circuit including at least one pair of switching transistors. Here, drains of the pair of switching transistors are connected to the output nodes respectively, and gates of the switching transistors are connected with the drains through a variable capacitance block exhibiting different characteristics according to an input signal. | 06-23-2011 |
20110148535 | VOLTAGE CONTROLLED OSCILLATOR - A voltage controlled oscillator includes a resonant circuit including one or more transformers and a plurality of variable capacitor circuits connected in parallel to the one or more transformers and generating a plurality of oscillation frequencies having multiple phases, and a negative resistance circuit including a plurality of transistors cross-coupled via the one or more transformers and generating negative resistance for maintaining the oscillation of the resonant circuit. | 06-23-2011 |
20110148536 | CIRCUIT ARRANGEMENT OF A VOLTAGE CONTROLLED OSCILLATOR - A circuit for a voltage controlled oscillator has a bridge structure including two cross-coupled N-type transistors and two cross-coupled P-type transistors. A current mirror is coupled to the two N-type cross-coupled transistors and configured to generate a bias current. An LC resonator is coupled in parallel between the two cross-coupled N-type transistors and the two P-type cross-coupled transistors. The LC resonator includes two pairs of differential inductors mutually coupled by a mutual inductance coefficient, each pair comprising a first inductor arranged on a respective branch of an external loop, and a second inductor arranged on a respective branch of an internal loop. A first varactor is coupled to a common node and a first branch of the internal loop. A second varactor is coupled to the common node and the second branch of the internal loop. | 06-23-2011 |
20110156829 | OSCILLATOR COMBINED CIRCUIT, SEMICONDUCTOR DEVICE, AND CURRENT REUSE METHOD - An oscillator combined circuit comprises: an oscillator including a resonance circuit that includes an inductor and capacitors, and a frequency divider that includes a differential pair that receives an oscillation output signal of the oscillator, and forms current paths from a power supply side, with first ends thereof on a side opposite to the first power supply being connected to the center tap of the inductor of the oscillator. The oscillator and the frequency divider are cascode-connected between ground and the power supply and a DC power supply current flowing from a DC supply current terminal of the frequency divider to a ground side is reused as a power supply current of the oscillator. | 06-30-2011 |
20110163821 | PIEZOELECTRIC VIBRATOR AND OSCILLATION CIRCUIT USING THE SAME - In a circuit including a CMOS inverter (inverting amplifier) (IV | 07-07-2011 |
20110175686 | HIGH FREQUENCY SECOND HARMONIC OSCILLATOR - A high frequency second harmonic oscillator includes a transistor, a first signal line connected at a first end to the base or gate of the transistor, a first shunt capacitor connected at a first end to a second end of the first signal line and at a second end to ground, a second signal line connected at a first end to the collector or drain of the transistor, a second shunt capacitor connected at a first end to a second end of the second signal line and at a second end to ground, and a high capacitance capacitor connected between the first signal line and the second signal line. The first signal line has a length equal to an odd integer multiple of one quarter of the wavelength of a fundamental signal, plus or minus one-sixteenth of the wavelength of the fundamental signal. | 07-21-2011 |
20110187469 | WIDEBAND OSCILLATION CIRCUIT - A wideband oscillation circuit outputting oscillation signals (divided signals) of continuous frequencies is disclosed and the wideband oscillation circuit includes an oscillator that outputs an oscillation signal, a filter that filters the oscillation signal output from the oscillator and outputs an injection locked signal, and an injection locked frequency divider that performs a free-run operation and outputs a divided signal of the oscillation signal while its oscillating operation is regulated by the injection locked signal, the division ratio of which varies in accordance with a control signal, wherein the filter generates the injection locked signal by controlling the passing characteristic that caused the oscillation signal to pass with respect to time in accordance with a filter control signal locked with the divided signal. | 08-04-2011 |
20110210799 | Frequency Synthesizer - A frequency synthesizer. The frequency synthesizer comprises a harmonic locked phase/frequency detector, a low pass filter, a voltage controlled oscillator, and a frequency divider. The harmonic locked phase/frequency detector receives a reference signal and a divided signal. The low pass filter is coupled to the harmonic locked phase/frequency detector. The voltage controlled oscillator is coupled to the low pass filter and provides an output signal. The frequency divider is coupled between the voltage controlled oscillator and the harmonic locked phase/frequency detector. Frequency of the divided signal is a harmonic frequency of the reference signal. | 09-01-2011 |
20110241787 | TECHNIQUE FOR DETECTING CRYSTALS - In at least one embodiment of the invention, an apparatus includes an integrated circuit, which includes a first oscillator terminal and an oscillator discrimination circuit. The oscillator discrimination circuit is operative to generate an indicator of a capacitance value of a load capacitance external to the integrated circuit and coupled to one of the first and second oscillator terminals. The indicator is generated according to a charge time of a reference node coupled to a reference capacitor and a charge time of a node coupled to the first oscillator terminal. The node and the reference node are charged using substantially matched currents. | 10-06-2011 |
20110241788 | MULTI-PHASE SIGNAL GENERATOR AND VOLTAGE-CONTROLLED OSCILLATOR THEREOF - A VCO comprising a cross-coupled transistors module and a resonant module is provided. The resonant module comprises a first transistor, second transistor, a first inductor and varactor string and a second inductor and varactor string. The first source/drain terminal of the first transistor coupled to the second reference voltage, the second source/drain terminal of the first transistor coupled to the cross-coupled transistors module and the gate terminal coupled to a bias voltage. The first source/drain terminal of the second transistor coupled to the second reference voltage, the second source/drain terminal of the second transistor coupled to the cross-coupled transistors module and the gate terminal of the second transistor coupled to the bias voltage. The first and second inductor and varactor strings coupled between the gate of the first and second transistors and a tuning voltage in serial, separately. | 10-06-2011 |
20110241789 | INTEGRATED CIRCUIT CAPABLE OF REPEATEDLY USING CURRENT - The invention relates to an integrated circuit capable of repeatedly using current, the integrated circuit comprises: a first differential input, a first cross couple pair, a second differential input, a second cross couple pair, and a voltage-controlled oscillator, wherein a divider consists of the first differential input, the first cross couple pair, the second differential input, and the second cross couple pair, moreover, through the connection of the first differential input, the first cross couple pair, the second differential input, and the second cross couple pair, the divider and the voltage-controlled oscillator may be drove by only one single current, so that the circuit area, the power consumption, and the phase noise of the integrated circuit are simultaneously reduced. | 10-06-2011 |
20110248787 | VARACTOR CIRCUIT AND VOLTAGE-CONTROLLED OSCILLATION - A varactor circuit and voltage-controlled oscillation are described. The varactor circuit includes a first varactor, a second varactor, a third varactor, and a fourth varactor. A first source-drain node of the first varactor and a second source-drain node of the second varactor are coupled to a first input node. A first gate node for the first varactor is coupled to a first output node. A second gate node for the second varactor is coupled to a second output node. A third gate node for the third varactor and a fourth gate node for the fourth varactor are coupled to a second input node. A third source-drain node of the third varactor is coupled to the first output node. A fourth source-drain node of the fourth varactor is coupled to the second output node. In other embodiments, varactor circuits block and re-center VCO output CML. | 10-13-2011 |
20110267148 | Multiphase VCO Circuits and Methods with Wide Tuning Range - A Multiphase VCO Circuits and Methods with Wide Tuning Range have been disclosed. | 11-03-2011 |
20110273239 | Dual positive-feedbacks voltage controlled oscillator - A dual positive-feedbacks voltage controlled oscillator includes an oscillation circuit and a cross coupled pair circuit. The oscillation circuit includes a first transistor, a second transistor, an inductor and a plurality of capacitors. The gates of the first and second transistors are opposite to each other and coupled to two points of the inductor. The inductor and the capacitors are formed as a LC tank. The cross coupled pair circuit includes a third transistor and a fourth transistor. The gates of the third and fourth transistors are cross coupled to two points of the inductor. Thereby, the gate of the third transistor is coupled to the gate of the second transistor; the gate of the fourth transistor is coupled to the gate of the first transistor; the drain of the third transistor is coupled to the source of the first transistor; and the drain of the fourth transistor is coupled to the source of the second transistor. | 11-10-2011 |
20110279186 | SEMICONDUCTOR DEVICE - A semiconductor device is provided which can reduce a parasitic inductor and/or parasitic capacitance added to the wiring that couples spiral inductors and MOS varactors included in a VCO. An LC-tank VCO includes first and second spiral inductors, and first and second MOS varactors. As seen perpendicularly to the semiconductor substrate, the first and second MOS varactors are arranged in a region between the first spiral inductor and the second spiral inductor. | 11-17-2011 |
20110298551 | INTEGRATED CIRCUITS AND METHODS OF FORMING THE SAME - A three-dimensional integrated circuit includes a semiconductor substrate where the substrate has an opening extending through a first surface and a second surface of the substrate and where the first surface and the second surface are opposite surfaces of the substrate. A conductive material substantially fills the opening of the substrate to form a conductive through-substrate-via (TSV). An active circuit is disposed on the first surface of the substrate, an inductor is disposed on the second surface of the substrate and the TSV is electrically coupled to the active circuit and the inductor. The three-dimensional integrated circuit may include a varactor formed from a dielectric layer formed in the opening of the substrate such that the conductive material is disposed adjacent the dielectric layer and an impurity implanted region disposed surrounding the TSV such that the dielectric layer is formed between the impurity implanted region and the TSV. | 12-08-2011 |
20110298552 | SEMICONDUCTOR DEVICE - According to one embodiment, there is a semiconductor device including a first active element, a second active element connected in parallel with the first active element, and a first stabilization circuit connected between a gate of the first active element and a gate of the second active element and configured with a parallel circuit of a gate bypass resistor, a gate bypass capacitor, and a gate bypass inductor, the first stabilization circuit having a resonant frequency equal to an odd mode resonant frequency. | 12-08-2011 |
20110309890 | OSCILLATOR AND ELECTRONIC DEVICE - According to one embodiment, an oscillator includes a resonant circuit and an amplifier circuit. The resonant circuit includes one end, one other end, and a frequency correction circuit. The amplifier circuit is connected in parallel with the resonant circuit. The amplifier circuit is configured to amplify a signal at the one end and to output to the one other end. The frequency correction circuit includes a first capacitor and a first transistor connected in series with the first capacitor so that potentials of both ends of the first transistor are variable. | 12-22-2011 |
20120001699 | SYSTEM AND METHOD FOR EXTENDING VCO OUTPUT VOLTAGE SWING - Voltage controlled oscillator (VCO) has been widely used in radio frequency communication systems. In a typical VCO implementation, a pair of directly cross-coupled MOS transistors is used as a switching device and an LC resonant circuit is used to tune the desired frequency. The direct cross coupling of the MOS transistor pair will result in limited output voltage swing since a large swing may cause the MOS transistors into a linear region to increase phase noise. The VCO system to increase the output voltage swing according to one embodiment of the present invention includes DC-blocking capacitors to avoid direct cross coupling of the MOS pair. The VCO further includes circuit to provide bias for the gate voltage of the MOS pair. A method for increasing the output voltage swing is disclosed for a VCO system having LC resonant circuit. The method includes providing DC-blocked cross coupling from the drains of the cross-coupled transistor pair to the gates of the cross-coupled transistor pair. The method also includes providing an offset voltage to the gates of the cross-coupled transistor pair to reduce the maximum gate-to-drain voltage of a cross-coupled NMOS transistor pair or maximum drain-to-gate voltage of a cross-coupled PMOS transistor pair so that the cross-coupled transistor pair will work in a saturation region when the output voltage swing is increased. | 01-05-2012 |
20120025921 | Low Noise VCO Circuit Having Low Noise Bias - A low noise VCO circuit for an LC VCO circuit comprising MOS varactors is disclosed. The LC VCO circuit usually comprises an LC tuning circuit coupled with a pair of cross-coupled transistors used as a negative impedance element. A pair of varactors is used to provide fine tuning by applying a control voltage to the varactor. Since the varactor is also coupled to the pair of cross-coupled transistor, the process variation and temperature change may affect the bias voltage coupled to the pair of varactors. Therefore, a bias circuit usually is used to alleviate the impact of process variation and temperature change associated with the pair of transistor. Nevertheless, the bias voltage typically is implemented by providing a current flowing through a resistor, wherein the current is generated by a current source. The noise associated with the current source will affect the performance of the VCO circuit. A low noise VCO circuit is disclosed which utilizes a low noise bias circuit. The low noise bias circuit comprises a current source, a load device and a voltage divider wherein the load device is coupled to the voltage divider in parallel. The load device may be implemented using a bipolar transistor or a diode-connected MOS device. | 02-02-2012 |
20120032746 | OSCILLATOR CIRCUIT - An oscillator circuit ( | 02-09-2012 |
20120038429 | Oscillator Circuits Including Graphene FET - An oscillator circuit includes a field effect transistor (FET), the FET comprising a channel, source, drain, and gate, wherein at least the channel comprises graphene; an LC component connected to the FET, the LC component comprising at least one inductor and at least one capacitor; and a feedback loop connecting the FET source to the FET drain via the LC component. | 02-16-2012 |
20120098608 | OSCILLATION CIRCUIT - An oscillation circuit includes a resonance circuit and an amplifier circuit. The resonance circuit includes an inner capacitor to be disposed inside a semiconductor integrated circuit, and an outer capacitor and an outer inductor to be disposed outside the semiconductor integrated circuit. The amplifier circuit includes an input terminal and an output terminal both connected to the resonance circuit. Further, the resonance circuit includes a first closed circuit portion including the inner capacitor, the outer inductor, and a first wiring portion for connecting the inner capacitor and the outer inductor. The resonance circuit further includes a second closed circuit portion including the outer capacitor, the outer inductor, and a second wiring portion for connecting the outer capacitor and the outer inductor. The second closed circuit portion has a wiring resistance smaller than that of the first closed circuit portion. | 04-26-2012 |
20120105162 | RESONANT OSCILLATOR WITH START UP AND SHUT DOWN CIRCUITRY - A system which starts up and shuts down a resonant oscillator circuit. During start up, the system operates a driving circuit, which is external to the resonant oscillator circuit, wherein the driving circuit uses a first clock signal to control a first phase output of the resonant oscillator circuit. At the same time, the driving circuit uses a second clock signal to control a second phase output of the resonant oscillator circuit, wherein the first and second clock signals have opposite phases. While the first and second phase outputs are being controlled, the system ramps up an input voltage, which is used to power the resonant oscillator circuit, wherein the ramping takes place across multiple initial oscillation periods. During shut down, the system shuts down the resonant oscillator circuit by ramping down the input voltage. Next, the system clamps the first and second phase outputs to a fixed voltage. | 05-03-2012 |
20120139651 | VOLTAGE CONTROL OSCILLATOR AND QUADRATURE MODULATOR - A voltage control oscillator includes: first and second field effect transistors, a drain of one of which is connected to a gate of the other and a drain of the other of which is connected to a gate of the one; third and fourth field effect transistors, a drain of one of which is connected to a gate of the other and a drain of the other of which is connected to a gate of the one; a first inductor connected between the drain of the first field effect transistor and the drain of the second field effect transistor; a second inductor connected between the drain of the third field effect transistor and the drain of the fourth field effect transistor; a third inductor magnetically coupled to the first inductor; a fourth inductor magnetically coupled to the second inductor; a first capacitor; and a second capacitor. | 06-07-2012 |
20120154067 | VOLTAGE-CONTROLLED OSCILLATOR - A voltage-controlled oscillator includes a resonator section in which a plurality of types of variable capacitance elements having different structures and capacitance variation characteristics are connected in parallel and capacitance values of the plurality of types of variable capacitance elements are controlled simultaneously by a control voltage; and an amplifier section for maintaining oscillation produced by the resonator section. Varactor diodes and MOS varactors can be used as the variable capacitance elements. | 06-21-2012 |
20120161890 | WIDEBAND MULTI-MODE VCO - A VCO includes a transformer-based resonator that has a first LC tank and a second LC tank. The resonator has an even resonant mode and an odd resonant mode. The VCO further includes an active transconductance network that is coupled to a two-terminal port of the first tank and is also coupled to a two-terminal port of the second tank. A first terminal of the port of the first tank is capacitively coupled to a first terminal of the port of the second tank. A second terminal of the port of the first tank is capacitively coupled to a second terminal of the port of the second tank. The active transconductance network causes the resonator to resonate in a selectable one of the even and odd resonant modes depending on a digital control signal. The VCO is fine tuned by changing the capacitances of capacitors of the tanks. | 06-28-2012 |
20120169428 | AC COUPLED STACK INDUCTOR FOR VOLTAGE CONTROLLED OSCILLATOR - A voltage controlled oscillator (VCO) may include a stack of a plurality of non-connected inductors that are magnetically and/or electrically through capacitor (AC) coupled to each other and not directly physically connected to each other. The plurality of inductors includes a first inductor connected to a supply voltage and a second inductor connected to a VCO control voltage. The VCO may include a first varactor having a gate coupled to a first terminal of the second inductor to receive the VCO control voltage, a second varactor having a gate coupled to a second terminal of the second inductor to receive the VCO control voltage, and an oscillator sub-circuit coupled to first and second terminals of the first inductor. In one example implementation, the second inductor may contribute to the overall inductance of the inductor stack and provide AC decoupling and/or DC coupling between the VCO control voltage and the varactor(s). | 07-05-2012 |
20120200364 | OSCILLATOR AND SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - An oscillator and a semiconductor integrated circuit device with an internal oscillator capable of compensating the temperature characteristics even when there is a large parasitic capacitance too large to ignore directly between the output terminals of the oscillator. In an oscillator containing an inductance element L, and a capacitive element C, and an amplifier each coupled in parallel across a first and second terminal, the amplifier amplifies the resonance generated by the inductance element and capacitive element and issues an output from the first terminal and the second terminal, and in which a first resistance element with a larger resistance value than the parasitic resistance of the inductance element between the first terminal and the second terminal, is coupled in serial with the capacitive element between the first terminal and the second terminal. | 08-09-2012 |
20120212300 | VARACTORLESS TUNABLE OSCILLATOR - A tunable oscillator circuit is disclosed. The tunable oscillator circuit includes an inductor/capacitor (LC) tank circuit comprising a primary inductor coupled in parallel with a first capacitor bank. The LC tank resonates to produce an oscillating voltage at a frequency. The tunable oscillator circuit also includes a 90 degree phase shift buffer coupled to the LC tank and a transconductor. The transconductor is coupled to the 90 degree phase shift buffer and a secondary inductor. The tunable oscillator circuit also includes a secondary inductor that is inductively coupled to the primary inductor and receives a gain-scaled oscillating current from the transconductor. By changing the transconductance, the gain-scaled oscillating current in the secondary inductor will change, thus the effective primary inductance and the oscillation frequency can be tuned. | 08-23-2012 |
20120235757 | VOLTAGE-CONTROLLED OSCILLATORS AND RELATED SYSTEMS - Apparatus are provided for voltage-controlled oscillators (VCOs) and related systems. An exemplary VCO includes an active-circuit arrangement employing cross-coupled amplifying elements that facilitate generation of an oscillating signal, plus a resonator arrangement capacitively coupled via resonator terminals to primary terminals of the active-circuit arrangement, to influence an oscillation frequency of the oscillating signal based on a difference between control voltages applied to first and second control terminals of the resonator arrangement. When employing bipolar amplifying elements their control terminals are cross-coupled to the opposing resonator terminals. VCO output may be taken from the primary terminals or from the resonator terminals. | 09-20-2012 |
20120268219 | SYNCHRONOUS FULL-BRIDGE POWER OSCILLATOR WITH LEG INDUCTORS - An electronic high frequency induction heater driver, for a variable spray fuel injection system, uses a zero-voltage switching oscillator that utilizes a full H-bridge topology with inductors between semiconductor switches wherein the semiconductor switches are synchronized within the bridge for function. The induction heater driver, upon receipt of a turn-on signal, multiplies a supply voltage through a self-oscillating series resonance, wherein one component of the tank resonator circuit comprises an induction heater coil magnetically coupled to an appropriate loss component so that fuel inside a fuel component is heated to a desired temperature. | 10-25-2012 |
20120268220 | SYNCHRONIZED ARRAY BRIDGE POWER OSCILLATOR - An electronic high frequency induction heater driver, for a variable spray fuel injection system, uses a scalable array of zero-voltage switching oscillators that utilize full and half-bridge topology wherein the semiconductor switches are synchronous within each bridge for function, and each bridge is synchronized for function along the entire array. The induction heater driver, upon receipt of a turn-on signal, multiplies a supply voltage through a self-oscillating series resonance, wherein one component of each tank resonator circuit comprises an induction heater coil magnetically coupled to an appropriate loss component so that fuel inside a fuel component is heated to a desired temperature. | 10-25-2012 |
20120286888 | Switched Capacitor Array for Voltage Controlled Oscillator - A system comprises a voltage controlled oscillator comprising an inductor and a variable capacitor and a switched capacitor array connected in parallel with the variable capacitor. The switched capacitor array further comprises a plurality of capacitor banks wherein a thermometer code is employed to control each capacitor bank. In addition, the switched capacitor array provides N tuning steps for the oscillation frequency of the voltage controlled oscillator when the switched capacitor array is controlled by an n-bit thermometer code. | 11-15-2012 |
20120286889 | Systems and Methods for Wideband CMOS Voltage-Controlled Oscillators Using Reconfigurable Inductor Arrays - As wireless communication technology evolves, various transceivers become integrated into a single system, which implements a seamless connection to search available frequency bands and to provide wireless connections regardless of their wireless standards. One of the key technologies for seamless implementation is an ultra-wideband local oscillator, which can overcome the restriction of limited tuning range in typical RF local oscillators. Many RF oscillators incorporate LC-tuned oscillators because of their good noise performance while their tuning range is limited by fixed inductance and varied capacitance. The planar inductor fabricated on the CMOS process occupies a large area as well. By replacing the planar inductor with the array of bondwires, and including switches to provide proper impedance for the circuit to generate negative impedance, the tuning range of a CMOS voltage-controlled oscillator (VCO) is extended more than 100%, which number can not be achieved in a convention VCO. | 11-15-2012 |
20120306584 | High Amplitude Voltage-Controlled Oscillator with Dynamic Bias Circuit - According to an exemplary embodiment, a high amplitude oscillation generator includes an LC tank circuit, a gain stage, a dynamic bias circuit, a bias current source, and a dynamic bias circuit receiving a current source feedback voltage and outputting a gain stage bias voltage. The dynamic bias circuit adjusts the gain stage bias voltage in response to a change in the current source feedback voltage after a start up of the LC tank circuit. The dynamic bias circuit thereby increases an amplitude of oscillations produced by the oscillation generator. The dynamic bias circuit can include an error amplifier, the error amplifier generating the gain stage bias voltage responsive to the current source feedback voltage. The current source feedback voltage can change with a voltage drop across the bias current source. The current source feedback voltage can also be received from an output of the oscillation generator. | 12-06-2012 |
20120319787 | VOLTAGE CONTROLLED OSCILLATOR HAVING A RESONATOR CIRCUIT WITH A PHASE NOISE FILTER - An oscillator circuit is provided for generating an oscillating signal. The oscillator circuit includes a transistor circuit, a resonator circuit, and first and second transmission line open stubs. The transistor circuit is coupled to a first node and a second node of the oscillator circuit. The transistor circuit is for facilitating oscillation of the oscillating signal. The resonator circuit is coupled to the first node and the second node, and includes an inductance and a capacitance. The first and second transmission line open stubs are coupled to the first and second nodes, respectively. The first and second transmission line open stubs have a length substantially equal to a quarter wavelength of a second harmonic of the oscillating signal, and are for removing the second harmonic from the oscillating signal. In another embodiment, first and second half wave AC shorted stubs are used to remove the second harmonic from the oscillating signal. | 12-20-2012 |
20130009715 | INDUCTANCE-CAPACITANCE (LC) OSCILLATOR - An inductance-capacitance (LC) oscillator including a first varactor cell, a first transistor, a second transistor and a first pair of differential transformers is provided. The first varactor cell provides a first variable capacitance to adjust/tune the frequency of a first differential oscillation signal generated by the LC oscillator, and outputting the first differential oscillation signal. The first transistor is coupled between a core dc supply voltage and a first terminal of the first varactor cell. The second transistor is coupled between a ground potential and a second terminal of the first varactor cell. The first pair of differential transformers is connected in cascade with the first transistor and the second transistor between the core dc supply voltage and the ground potential, and is used for increasing the output-swing of the first differential oscillation signal, and making a current flowing through the first transistor to be reused by the second transistor. | 01-10-2013 |
20130038399 | OSCILLATION CIRCUIT AND ASSOCIATED METHOD - An oscillation circuit and associated method, wherein the oscillation circuit provides a pair of oscillation signals at two oscillation nodes, and includes a first capacitor, a switch circuit and a second capacitor serially coupled between the two oscillation nodes; the switch circuit conducts between the first capacitor and the second capacitor on an enable voltage higher than a power voltage of the oscillation circuit. | 02-14-2013 |
20130043958 | DIGITALLY CONTROLLED OSCILLATOR - A digitally controlled oscillator is provided. The digitally controlled oscillator includes a pair of transistors cross-coupled to each other, a switched capacitor array coupled to the pair of transistors and a plurality of frequency tracking units coupled to the pair of transistors. The pair of transistors provides an output signal. The switched capacitor array tunes a frequency of the output signal. The frequency tracking units tune the frequency of the output signal to a target frequency. At least one of the frequency tracking units is capable of selectively providing a first capacitance and a second capacitance. A tuning resolution of the frequency tracking unit is determined by a difference between the first and second capacitances. | 02-21-2013 |
20130063218 | FULLY DECOUPLED LC-TANK BASED OSCILLATOR TOPOLOGY FOR LOW PHASE NOISE AND HIGH OSCILLATION AMPLITUDE APPLICATIONS - There is provided a tank based oscillator. The oscillator includes one or more active devices, one or more passive devices, and a tank circuit decoupled from the active devices using at least one of the one or more passive devices. A coupling ratio between the tank circuit and the one or more active devices is set such that a maximum value of an oscillation amplitude of the tank circuit is limited based upon a breakdown of only the one or more passive devices. | 03-14-2013 |
20130063219 | LOW NOISE OSCILLATOR HAVING SWITCHING NETWORK - Apparatus and methods are also disclosed related to an oscillator that includes a switching network configured to tune a resonant frequency of a resonant circuit. One such apparatus includes a switching network having a circuit element, such as a capacitor, that can be selectively coupled to the resonant circuit by a switch, such as a field effect transistor. For instance, the switch can electrically couple to circuit element to the resonant circuit when on and not electrically couple the circuit element to the resonant circuit when off. An active circuit can assert a high impedance on an intermediate node between the switch and the circuit element when the switch is off. | 03-14-2013 |
20130082790 | VOLTAGE-CONTROLLED OSCILLATORS AND RELATED SYSTEMS - Apparatus are provided for voltage-controlled oscillators and related systems. An exemplary voltage-controlled oscillator includes a first variable capacitance element, a second variable capacitance element coupled between the first control voltage node and the third node, and an inductive element coupled between the variable capacitance elements to provide an inductance between the variable capacitance elements at an oscillation frequency of an oscillating signal at an output node. The first variable capacitance element is coupled between a first control voltage node and the output node, the second variable capacitance element is coupled to the first control voltage node, and a second inductive element is coupled between the second variable capacitance element and a second control voltage node. | 04-04-2013 |
20130135057 | Common Mode Rejection Circuit - An electrical circuit includes a circuit element and a common mode rejection circuit element. The circuit element is configured to operate at a selected frequency within a variable frequency range and the common mode rejection circuit element is configured to reject a common mode current through the circuit element, wherein the common mode rejection circuit element is adjustable. | 05-30-2013 |
20130141176 | Highly Linear-Gain Oscillator - A variable frequency oscillator includes an inductance unit having a first inductance, a first variable capacitor coupled across the inductance unit, and a second variable capacitor coupled across a part of the inductance unit. The inductance of the part of the inductance unit coupled by the second variable capacitor is a proportion of the first inductance. | 06-06-2013 |
20130141177 | TUNABLE INDUCTOR CIRCUIT - A tunable inductor circuit is disclosed. The tunable inductor circuit includes a first inductor. The tunable inductor circuit also includes a second inductor in parallel with the first inductor. The tunable inductor circuit also includes a switch coupled to the second inductor. A resistance of the switch is added in parallel to the first inductor based on operation of the switch. | 06-06-2013 |
20130141178 | Injection Locked Divider with Injection Point Located at a Tapped Inductor - Injection locked dividers provide a divided clock signal after being driven by a injected clock signal that is a multiple of the divided clock signal. At injected clock signal at 60 GHz generates a differential 30 GHz clock signal. One innovative construction of the injection locked oscillator reduces the internal capacitive at a node by associating the parasitic capacitance at this node with the inductors of the tapped inductor resonant circuit. This provides more energy flow in the injection pulses applied to the legs of the injection locked circuit providing an increase locking range. | 06-06-2013 |
20130147566 | VARACTOR VOLTAGE CONTROLLED OSCILLATOR (VCO) PROVIDING INDEPENDENT COARSE AND FINE FREQUENCY TUNING - A voltage controlled oscillator, includes a tank circuit including an inductor having a value L, interconnected with first and second variable capacitors, having values C | 06-13-2013 |
20130154752 | VOLTAGE-CONTROLLED OSCILLATOR - A voltage-controlled oscillator circuit includes a first transistor, a second transistor, a first resonator circuit, a second resonator circuit, a first current path and a second current path. A drain of the first transistor is coupled to a gate of the second transistor and to a first end of the first resonator circuit. A source of the first transistor is coupled to the first current path and to a first end of the second resonator circuit. A drain of the second transistor is coupled to a gate of the first transistor and to a second end of the first resonator circuit. A source of the second transistor is coupled to the second current path and a second end of the second resonator circuit. | 06-20-2013 |
20130162361 | OSCILLATOR CIRCUIT AND METHOD FOR GENERATING AN OSCILLATION - The invention relates to an oscillator circuit, comprising a clipping element for generating a clipped signal, and a first amplification stage for amplifying and filtering the clipped signal to obtain a filtered signal, wherein the clipping element is configured to generate the clipped signal upon the basis of the filtered signal. | 06-27-2013 |
20130169373 | Method and Apparatus of Capacitively Coupling an Adjustable Capacitive Circuit in a VCO - Capacitive adjustment in an RCL resonant circuit is typically performed by adjusting a DC voltage being applied to one side of the capacitor. One side of the capacitor is usually connected to either the output node or the gate of a regenerative circuit in an RCL resonant circuit. The capacitance loading the resonant circuit becomes a function of the DC voltage and the AC sinusoidal signal generated by the resonant circuit. By capacitively coupling both nodes of the capacitor, a DC voltage can control the value of the capacitor over the full swing of the output waveform. In addition, instead of the RCL resonant circuit driving a single differential function loading the outputs, each output drives an independent single ended function; thereby providing two simultaneous operations being determined in place of the one differential function. | 07-04-2013 |
20130169374 | VOLTAGE CONTROLLED OSCILLATOR - Voltage controlled oscillators are disclosed. The voltage controlled oscillator includes an inductive circuit, a cross-coupled N-type transistor pair, and a cross-coupled P-type transistor pair. The inductive circuit includes two inductive windings stacked together, and is configured to generate a pair of differential resonance signals. The cross-coupled N-type transistor pair is coupled in series with the inductive circuit, and configured to receive the pair of differential resonance signals to generate a first oscillation signal. The cross-coupled P-type transistor pair is coupled in series with the inductive circuit, and configured to receive the pair of differential resonance signals to generate a second oscillation signal. The first oscillation signal and second oscillation signal include substantially the same frequency and are out-of-phase to each other. The first oscillation and second oscillation signal have substantially the same frequency which is twice that of the pair of the differential resonance signals. | 07-04-2013 |
20130181783 | RESONATOR CIRCUIT AND METHOD OF GENERATING A RESONATING OUTPUT SIGNAL - A resonator circuit enabling temperature compensation includes an inductor coupled between a first node and a second node of the resonator circuit; a capacitor circuit coupled between the first node and the second node; and a temperature compensation circuit coupled between the first node and the second node. The temperature compensation circuit comprises a varactor coupled to receive a temperature control signal that sets the capacitance of the varactor. A method of generating a resonating output is also disclosed. | 07-18-2013 |
20130181784 | VARIABLE CAPACITANCE DEVICE - A variable capacitance device including: first and second transistors coupled in parallel between first and second nodes of the capacitive device, a control node of the first transistor being adapted to receive a control signal, and a control node of the second transistor being adapted to receive the inverse of the control signal, wherein the first and second transistors are formed in a same semiconductor well. | 07-18-2013 |
20130181785 | DEVICE OF VARIABLE CAPACITANCE - A variable capacitance device including: first and second transistors coupled in series by their main current nodes between first and second nodes of the device, a control node of the first transistor being adapted to receive a first control signal, and a control node of the second transistor being adapted to receive a second control signal; and control circuitry adapted to generate the first and second control signals from a selection signal. | 07-18-2013 |
20130271230 | INTEGRATED STANDING-WAVE VOLTAGE CONTROLLED OSCILLATOR WITH DUAL-MODE COPLANAR WAVEGUIDE RESONATOR - A standing wave oscillator includes a cross-coupled differential transistor pair having a pair of input terminals and a pair of output terminals; and a resonant circuit coupled to the input terminals of the cross-coupled differential transistor pair. The resonant circuit includes: a capacitance between the input terminals of the cross-coupled differential transistor pair; and a differential dual-mode coplanar waveguide (CPW) having opposite differential ends thereof connected to respective input terminals of the cross-coupled differential transistor pair. CPW ground lines of the differential dual-mode coplanar waveguide each have a first end thereof connected to the first supply voltage and have a second end thereof floating or unterminated. | 10-17-2013 |
20140009236 | CONFIGURABLE MULTI-MODE OSCILLATORS - Multi-mode oscillators supporting multiple modes and having different desirable characteristics (e.g., good phase noise or low power consumption) in different modes are disclosed. In an exemplary design, an apparatus includes first and second transistors of a first transistor type (e.g., NMOS transistors) and third and fourth transistors of a second transistor type (e.g., PMOS transistors) for a multi-mode oscillator. The third and fourth transistors are coupled (e.g., directly) to the first and second transistors. The first and second transistors are enabled in a first mode to provide signal gain for the oscillator and generate an oscillator signal in the first mode. The first to fourth transistors are enabled in a second mode to provide signal gain for the oscillator and generate the oscillator signal in the second mode. Different supply voltages may be provided at different supply nodes of the oscillator in the first and second modes. | 01-09-2014 |
20140028406 | VOLTAGE CONTROLLED OSCILLATOR - A bias loop is used to program LC tank common mode voltage to allow operation at two different supply voltages VDD (e.g., 2.5V and 1.2V), and two different tank swings. This also allows lower phase noise through optimizing Ids shape allowing class C operation for both voltages. The two different supply voltages allow operation using multiple communication protocols such as 802.11n and 802.11ac within a common VCO circuit. The VCO can form part of a transceiver to provide frequencies in multiple bands. | 01-30-2014 |
20140049330 | INTEGRATED CIRCUIT - An integrated circuit device has an LC tank circuit for frequency determination, and a switched capacitor circuit for tuning the resonant frequency of the LC tank. The switched capacitor circuit has plural sets of parallel branches, each set comprising a first branch and a second branch, the first and second branches each connecting between a first node and a second node, each branch containing a respective capacitor in series with a switch, the switched capacitor circuit being configured such that, in use, the switch of the first branch is on when the switch of the second branch is off and vice versa. | 02-20-2014 |
20140070898 | Low Phase Noise Voltage Controlled Oscillators - A voltage controlled oscillator (VCO) with low phase noise and a sharp output spectrum is desirable. The present disclosure provides embodiments of LC tank VCOs that generate output signals with less phase noise compared with conventional LC tank VCOs, while at the same time limiting additional cost, size, and/or power. The embodiments of the present disclosure can be used, for example, in wired or wireless communication systems that require low-phase noise oscillator signals for performing up-conversion and/or down-conversion. | 03-13-2014 |
20140070899 | CANCELLING SUPPLY NOISE IN A VOLTAGE CONTROLLED OSCILLATOR CIRCUIT - A voltage controlled oscillator (VCO) core for cancelling a supply noise is described. The VCO core includes an input node that receives the supply noise. The VCO core also includes a noise path coupled to the input node. The VCO core additionally includes a cancellation path coupled to the input node and the noise path. The cancellation path includes a programmable gain circuit coupled with a first terminal of a varactor. The supply noise passes through the programmable gain circuit to produce a cancellation noise. | 03-13-2014 |
20140104010 | Method and Apparatus for a Duty-Cycled Harmonic Injection Locked Oscillator - A method and an apparatus for a duty-cycled injection locked oscillator is provided for frequency shift keyed (FSK) signal transmissions. The oscillator includes a resonance LC tank and a first switching device. The first switching device is coupled to the resonance LC tank and injects an initial current pulse with a predetermined pulse magnitude into the resonance LC tank. The initial current pulse also fixes an initial phase of the duty-cycled injection locked free-running oscillator in response to the predetermined magnitude of the initial current pulse to enable fast settling of injection locking and high data rate operation of the duty-cycled injection locked oscillator. The oscillator also includes a second switching device, such as a differential pair of switching devices. The second switching device is coupled to the LC resonance tank for injecting a gated periodic reference signal having a duty cycle modified to reduce power of the reference signal by approximately seventy-five per cent. | 04-17-2014 |
20140191816 | DESIGN STRUCTURE FOR AN INDUCTOR-CAPACITOR VOLTAGE-CONTROLLED OSCILLATOR - Embodiments of the present invention provide a design structure and method for compensating for a change in frequency of oscillation (FOO) of an LC-tank VCO that includes a first node; second node; inductor; first capacitive network (FCN) that allows the design structure to obtain a target FOO; compensating capacitive (CCN) network that compensates for a change in the design structure's FOO; second capacitive network (SCN) that allows the design structure to obtain a desired FOO; a filter that supplies a voltage to the SCN and is coupled to the SCN; a transconductor that compensates for a change in the design structure's FOO; and a sub-circuit coupled to the SCN that generates and supplies voltage to the CCN sufficient to allow the CCN to compensate for a reduction in the design structure's FOO. The first and second nodes are coupled to the inductor, FCN, CCN, SCN, and sub-circuit. | 07-10-2014 |
20140203881 | Ultra-Low Voltage-Controlled Oscillator with Trifilar Coupling - The present disclosure relates to a device and method to reduce voltage headroom within a voltage-controlled oscillator by utilizing trifilar coupling or transformer feedback with a capacitive coupling technique. In some embodiments of trifilar coupling, a VCO comprises cross-coupled single-ended oscillators, wherein the voltage of first gate within a first single-ended oscillator is separated from the voltage of a second drain within a second single-ended oscillator within the cross-coupled pair. A trifilar coupling network is composed of a drain inductive component, a source inductive component, and a gate inductive component for a single-ended oscillator, wherein a coupling between drain inductive components and gate inductive components between single-ended oscillators along with a negative feedback loop within each single-ended oscillator forms a cross-coupled pair of transistors which reduces the drain-to-source voltage headroom to approximately a saturation voltage of a transistor within the cross-coupled pair. Other devices and methods are also disclosed. | 07-24-2014 |
20140203882 | OSCILLATOR AND SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - An oscillator and a semiconductor integrated circuit device with an internal oscillator capable of compensating the temperature characteristics even when there is a large parasitic capacitance too large to ignore directly between the output terminals of the oscillator. In an oscillator containing an inductance element L, and a capacitive element C, and an amplifier each coupled in parallel across a first and second terminal, the amplifier amplifies the resonance generated by the inductance element and capacitive element and issues an output from the first terminal and the second terminal, and in which a first resistance element with a larger resistance value than the parasitic resistance of the inductance element between the first terminal and the second terminal, is coupled in serial with the capacitive element between the first terminal and the second terminal. | 07-24-2014 |
20140266479 | HYBRID VOLTAGE CONTROLLED OSCILLATOR - A method, an apparatus, and a computer program product are provided. The apparatus provides a VCO signal. The apparatus is a VCO. The apparatus includes a first transconductance circuit. The apparatus further includes a second transconductance circuit coupled with the first transconductance circuit. The second transconductance circuit has a first configuration/mode (e.g., CMOS configuration/mode) and a second configuration/mode (e.g., NMOS configuration/mode or PMOS configuration/mode). The second transconductance circuit is configured to couple an input of the second transconductance circuit to the first transconductance circuit in the first configuration/mode. The second transconductance circuit is configured to isolate the input of the second transconductance circuit from the first transconductance circuit in the second configuration/mode. The second transconductance circuit may include a first transistor and a second transistor, and the input may be a gate of each of the first transistor and the second transistor. | 09-18-2014 |
20140266480 | Digitally Controlled Injection Locked Oscillator - An injection locking oscillator (ILO) comprising a tank circuit having a digitally controlled capacitor bank, a cross-coupled differential transistor pair coupled to the tank circuit, at least one signal injection node, and at least one output node configured to provide an injection locked output signal; a digitally controlled injection-ratio circuit having an injection output coupled to the at least one signal injection node, configured to accept an input signal and to generate an adjustable injection signal applied to the at least one injection node; and, an ILO controller connected to the capacitor bank and the injection-ratio circuit configured to apply a control signal to the capacitor bank to adjust a resonant frequency of the tank circuit and to apply a control signal to the injection-ratio circuit to adjust a signal injection ratio. | 09-18-2014 |
20140266481 | OSCILLATOR WITH PRIMARY AND SECONDARY LC CIRCUITS - One aspect of this disclosure is an apparatus including an oscillator that includes a secondary LC circuit to increase a tuning range of the oscillator and/or to reduce a phase noise of the oscillator. Another aspect of this disclosure is an apparatus that includes oscillator with a primary LC circuit and a secondary LC circuit. This oscillator can operate in a primary oscillation mode or a secondary oscillation mode, depending on whether oscillation is set by the primary LC circuit or the secondary LC circuit. | 09-18-2014 |
20140300424 | TRANSFORMER-BASED CMOS OSCILLATORS - Techniques for providing transformer-based CMOS oscillators capable of operation with low voltage power supplies. In an exemplary embodiment, an LC tank is provided at the drains of a transistor pair, and the inductance of the LC tank is mutually magnetically coupled to an inductance between the gates of the transistor pair. A separate complementary transistor pair is also coupled to the LC tank. A further exemplary embodiment provides an LC tank at the gates of a transistor pair, as well as for three-way coupling amongst a tank inductance, an inductance between the gates of the transistor pair, and an inductance between the gates of a complementary transistor pair. | 10-09-2014 |
20140327487 | Oscillator Having Dual Topology - An oscillator ( | 11-06-2014 |
20140368285 | VOLTAGE-CONTROLLED OSCILLATOR - An apparatus is disclosed that includes a first cross-coupled transistor pair, a second cross-coupled transistor pair, at least one capacitance unit, and an inductive unit. The first cross-coupled transistor pair and second cross-coupled transistor pair are coupled to a pair of first output nodes and a pair of second output nodes, respectively. The at least one capacitance unit is coupled to at least one of the pair of first output nodes and the pair of second output nodes. The inductive unit is coupled to the first cross-coupled transistor pair at the first output nodes and coupled to the second cross-coupled transistor pair at the second output nodes. The inductive unit generates mutual magnetic coupling between one of the first output nodes and one of the second output nodes and between the other of the first output nodes and the other of the second output nodes. | 12-18-2014 |
20150077191 | CURRENT RE-USE OSCILLATOR, DOUBLER AND REGULATOR CIRCUIT - There is provided an integrated electronic circuit. The integrated electronic circuit includes a voltage controlled oscillator and a frequency doubler connected to the voltage controlled oscillator. A frequency doubling input of the frequency doubler is load isolated from an output of the voltage controlled oscillator. | 03-19-2015 |
20150077192 | CURRENT RE-USE OSCILLATOR, DOUBLER AND REGULATOR CIRCUIT - There is provided an integrated electronic circuit. The integrated electronic circuit includes a voltage controlled oscillator and a frequency doubler connected to the voltage controlled oscillator. A frequency doubling input of the frequency doubler is load isolated from an output of the voltage controlled oscillator. | 03-19-2015 |
20150303871 | HIGH FREQUENCY OSCILLATOR CIRCUIT - An oscillator circuit includes a field effect transistor and a resonant circuit having a first terminal connected to the field effect transistor. The resonant circuit includes an inductance and a capacitance and has a second terminal for connecting to a radiator. The field effect transistor includes a gate electrode coupled to a source of gate voltage, a source electrode, a drain electrode and a graphene channel disposed between the source electrode and the drain electrode and electrically connected thereto. The graphene channel is disposed relative to the gate electrode for being biased by the gate electrode into a negative differential resistance region of operation. The oscillator circuit is capable of generating a continuous wave THz frequency signal, and is further capable of being enabled and disabled by the bias applied to the gate electrode. | 10-22-2015 |
20150357977 | PHASE NOISE REDUCTION IN LC-VCO - An approach for a transconductance cell for use in a voltage controlled oscillator (VCO) is provided. The transconductance cell includes a first NFET stack connected in series to a first PFET stack. The transconductance cell includes a second NFET stack connected in series to a second PFET stack. The first NFET stack and the first PFET stack are cross-coupled to the second NFET stack and the second PFET stack. The first NFET stack and the second NFET stack are connected to a tail node. The first PFET stack and the second PFET stack are connected to a power supply node. | 12-10-2015 |
20150381157 | SERIES-RESONANCE OSCILLATOR - An oscillator circuit comprises a first tank circuit comprising an inductive element and a capacitive element coupled in series between a first voltage rail and a first drive node. A feedback stage is coupled to a first tank output of the first tank circuit and to the first drive node. The feedback stage is arranged to generate, responsive to a first oscillating tank voltage present at the first tank output, a first oscillating drive voltage at the first drive node in-phase with a first oscillating tank current flowing in the inductive element and the capacitive element, thereby causing the oscillator to oscillate in a series resonance mode of the inductive element and the capacitive element. | 12-31-2015 |
20160006394 | System and Method for a Voltage Controlled Oscillator - In accordance with an embodiment, an oscillator includes a tank circuit and an oscillator core circuit having a plurality of cross-coupled compound transistors coupled to the tank circuit. Each of the plurality of compound transistors includes a bipolar transistor and a field effect transistor (FET) having a source coupled to a base of the bipolar transistor. | 01-07-2016 |
20160056762 | Split Transformer Based LC-Tank Oscillator - A novel and useful LC-tank digitally controlled oscillator (DCO) incorporating a split transformer configuration. The LC-tank oscillator exhibits a significant reduction in area such that it is comparable in size to conventional ring oscillators (ROs) while still retaining its salient features of excellent phase noise and low sensitivity to supply variations. The oscillator incorporates an ultra-compact split transformer topology that is less susceptible to common-mode electromagnetic interference than regular high-Q LC tanks which is highly desirable in SoC environments. The oscillator, together with a novel dc-coupled buffer, can be incorporated within a wide range of circuit applications, including clock generators and an all-digital phase-locked loop (ADPLL) intended for wireline applications. | 02-25-2016 |
20160072434 | HIGH FREQUENCY INTEGRATED CIRCUIT AND DEVICE USING SAME - Provided is an amplifier with a test oscillator for a high frequency characteristic monitor, which has small power loss in a normal operation state and secures good noise performance while it is possible to equip both a transmitter IC and a receiver IC with the amplifier. In a high frequency IC including an amplifier including an inductive load and a test oscillator arranged in a same chip, the test oscillator commonly uses the inductive load of the amplifier, the amplifier has a bias voltage terminal to switch an operation state into an active state/inactive state, and the oscillator has a bias voltage terminal to switch an operation state into an active state/inactive state. In a test operation mode, the amplifier is inactivated and the test oscillator is activated and in a normal operation mode, the amplifier is activated and the test oscillator is inactivated. | 03-10-2016 |
20160099679 | Switching Current Source Radio Frequency Oscillator - A novel and useful RF oscillator suitable for use in applications requiring ultra-low voltage and power. The oscillator structure, employing alternating current source transistors, combines the benefits of low supply voltage operation of conventional NMOS cross-coupled oscillators together with high current efficiency of the complementary push-pull oscillators. In addition, the 1/f noise upconversion is also reduced. The oscillator can be incorporated within a wide range of circuit applications, including for example a conventional phase locked loop (PLL), all-digital phase-locked loop (ADPLL), wireline transceiver circuits and mobile devices. | 04-07-2016 |
20160099681 | 60 GHz Frequency Generator Incorporating Third Harmonic Boost And Extraction - A novel and useful 60 GHz frequency generator based on a third harmonic extraction technique which improves system level efficiency and performance. The frequency generator employs a third harmonic boosting technique to increase the third harmonic at the output of the oscillator. The oscillator generates both ˜20 GHz fundamental and a significant amount of the third harmonic at ˜60 GHz and avoids the need for a frequency divider operating at 60 GHz. The undesired fundamental harmonic at ˜20 GHz is rejected by the good fundamental HRR inherent in the oscillator buffer stage while the ˜60 GHz component is amplified to the output. The fundamental harmonic is further suppressed by an active cancellation by properly combining the two outputs. The oscillator fabricated in 40 nm CMOS exhibits a phase noise of −100 dBc/Hz at 1 MHz offset from a 60 GHz carrier and have a tuning range of 25%. | 04-07-2016 |
20160112006 | DIGITAL CONTROLLED OSCILLATOR AND SWITCHABLE VARACTOR FOR HIGH FREQUENCY LOW NOISE OPERATION - Low noise switchable varactors and digital controlled oscillator (DCO) circuitry are presented for creating alternating signals at controlled frequencies, including a first transistor for selectively coupling two capacitors between varactor output nodes when a control signal is in a first state, second and third transistors for selectively coupling first and second internal nodes between the respective capacitors and the first transistor with a third internal node when the control signal is in the first state, and an inverter disconnected from the first and second internal nodes to mitigate phase noise and operable to control the voltage of the third internal node according to the control signal. | 04-21-2016 |
20160126887 | CROSS-COUPLED OSCILLATOR, INTEGRATED CIRCUIT AND ELECTRONIC DEVICE - A cross-coupled oscillator arrangement has a first resistance-capacitance oscillator core including at least two inverting stages; and a second resistance-capacitance oscillator core substantially identical to the first resistance-capacitance oscillator core. The first oscillator core and second oscillator core are cross coupled in anti-phase using coupling capacitors. The first oscillator core and second oscillator core are also connected in series such that the first oscillator core is supplied with a supply between a first potential and a second potential and the second oscillator core is supplied with a supply between the second potential and a third potential. | 05-05-2016 |
20160156311 | ADJUSTING THE MAGNITUDE OF A CAPACITANCE OF A DIGITALLY CONTROLLED CIRCUIT | 06-02-2016 |
20160190985 | VOLTAGE-CONTROLLED OSCILLATOR - A voltage-controlled oscillator includes two first inductors having a common node, two varactors receiving a first bias voltage and respectively coupled to the first inductors, first and second transistors each having a first terminal coupled to a respective one of the varactors, and two second inductors. One of the second inductors is coupled between the control terminal of the first transistor and the first terminal of the second transistor. The other second inductor is coupled between the control terminal of the second transistor and the first terminal of the first transistor. An oscillatory signal pair is provided at the first terminals of the first and second transistors. | 06-30-2016 |
20160204738 | SYSTEM AND METHOD FOR DYNAMICALLY BIASING OSCILLATORS FOR OPTIMUM PHASE NOISE | 07-14-2016 |
20160254816 | VOLTAGE CONTROLLED OSCILLATOR | 09-01-2016 |