Class / Patent application number | Description | Number of patent applications / Date published |
455118000 | Frequency conversion | 41 |
20080220733 | Fast frequency range selection in ranged controlled oscillators - Methods and apparatus for fast frequency range selection in ranged controlled oscillators. An exemplary frequency range selection apparatus includes a ranged voltage controlled oscillator (VCO) configured within a frequency control loop (e.g., within a phase-locked loop (PLL)), and a range select controller. The range select controller is configured to receive a phase difference signal from a frequency/phase detector and a fine tuning signal from the output of a loop filter. The range select controller uses the error and fine tuning signals to determine which range setting code should be applied to the range setting input of the VCO. The ability to use information obtained exclusively from the control loop avoids the need to perform a separate open-loop range selection process, as is required in prior art range selection approaches. Because the control loop never needs to be opened, the range selection process is substantially less time consuming compared to prior art approaches. | 09-11-2008 |
20080254755 | Radio Receiver and Radio Transmitter - In a radio receiver including an aerial wire ( | 10-16-2008 |
20090036069 | LO 2LO Upconverter For An In-Phase/Quadrature-Phase (I/Q) Modulator - An upconverter includes a switching architecture configured to receive an input signal, a first local oscillator (LO) signal, and a second local oscillator (2LO) signal that is at a frequency that is twice a frequency of the local oscillator (LO) signal, wherein the switching architecture is configured to switch the input signal on transitions of the second local oscillator (2LO) signal, and wherein the first local oscillator signal and the second local oscillator signal are combined to form combined LO 2LO switching signals. | 02-05-2009 |
20090054017 | Signal amplifier structure for radio transmitter - There is provided a modular amplifier structure that includes a plurality of parallel amplifier sub-units. Each amplifier sub-unit is configured to amplify a received payload signal under control of at least one received control signal. Outputs of the amplifier sub-units are applied to a combining circuit. The combining circuit is configured to combine the outputs of the plurality of amplifier sub-units to provide an amplified payload signal. | 02-26-2009 |
20090088095 | AMPLIFIER, RADIO TRANSMITTING APPARATUS, AND RADIO RECEIVING APPARATUS - An amplifier includes: an input terminal configured to have an input signal of a center frequency f | 04-02-2009 |
20090170452 | Integrated RF-IF converter - A frequency conversion apparatus includes a frequency generation circuit, which is based on a first semiconductor material having a first elemental composition and is coupled to generate one or more Local Oscillator (LO) signals. The apparatus further includes a conversion circuit, which is based on a second semiconductor material having a second elemental composition different from the first elemental composition. The conversion circuit is coupled to accept an input signal in a first frequency range and to convert the input signal to an output signal in a second frequency range by mixing the input signal with the one or more LO signals. | 07-02-2009 |
20090181627 | Applications of Universal Frequency Translation - Frequency translation and applications of same are described herein. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and filtering, and combinations and applications of same. | 07-16-2009 |
20090253389 | EFFICIENT POWER AMPLIFIER - A technique for efficient power amplification includes providing multiple baseband signals to an amplifier. The signals may be converted to RF and combined through one or more impedance inverters. | 10-08-2009 |
20090253390 | WCDMA TRANSMIT ARCHITECTURE - Wideband-Code Division Multiple Access (W-CDMA) transmit architecture. A baseband digital processing module operates cooperatively with an analog signal processing module to effectuate highly adjustable and highly accurate gain adjustment in accordance with transmitter processing within a communication device. The gain adjustment and/or gain control is partitioned between the digital and analog domains by employing two cooperatively operating digital and analog modules, respectively. Gain adjustment in the analog domain is performed in a relatively more coarse fashion that in the digital domain. If desired, gain adjustment in each of the analog and digital domains is performed across a range of discrete steps. The discrete steps in the analog domain are larger than the discrete steps in the digital domain. Also, the discrete steps in the digital domain may be interposed between two successive discrete steps in the analog domain. | 10-08-2009 |
20090258615 | Compensation of an asymmetric frequency response of a radio - A method and apparatus of compensating for an asymmetric frequency response of a radio are disclosed. One method includes estimating a slope control signal, the slope control signal indicating a slope of a frequency response of an amplifier chain of the radio. A difference between gain at positive frequencies and gain at negative frequencies of a complex baseband signal is adjusted with the slope control signal, wherein the complex signal includes an I component and a Q component. The adjusted complex baseband signal is frequency up-converted into a radio signal. The radio signal is amplified by the amplifier chain. The amplified radio signal is transmitted. | 10-15-2009 |
20090291652 | FILTER CIRCUIT, WIRELESS TRANSMITTER, AND WIRELESS RECEIVER - A filter circuit is constructed of a passive mixer and a frequency response device. The passive mixer generates a frequency-converted signal by mixing an input signal transmitted through a transmission line and a local oscillation signal, and outputs the frequency-converted signal to the frequency response device, thus shifting a frequency characteristic of the frequency response device to high frequency by a local oscillation frequency of the local oscillation signal and applying the frequency characteristic shifted to high frequency on the input signal. | 11-26-2009 |
20090318097 | Method and System for Frequency Up-Conversion - A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the invention is used as a transmitter. The up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used as a frequency or phase reference, the oscillating signal is not modulated, and controls a switch that is connected to a bias signal. When the invention is being used in the frequency modulation (FM) or phase modulation (PM) implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate the bias signal. In the amplitude modulation implementation (AM), the oscillating signal is not modulated, but rather causes the switch to gate a reference signal that is substantially equal to or proportional to the information signal. In the FM and PM implementations, the signal that is output from the switch is modulated substantially the same as the modulated oscillating signal. In the AM implementation, the signal that is output from the switch has an amplitude that is a function of the information signal. In both embodiments, the output of the switch is filtered, and the desired harmonic is output. | 12-24-2009 |
20090318098 | MULTI-FREQUENCY TRANSMITTER FOR A METAL DETECTOR - A method for generating a transmit signal for transmission including the steps of a) generating at least two selected rectangular wave signals, each having a different fundamental frequency; b) mixing the selected rectangular wave signals to produce a driving signal; and c) driving a switching circuit using the driving signal for generating a transmit signal for transmission, wherein the Fourier transform of the transmit signal contains frequency components of relatively high magnitude, at frequencies corresponding to the convolution of the fundamental frequencies of the said at least two selected rectangular wave signals, as compared to other frequency components across the frequency spectrum of the Fourier transform, and wherein the rectangular wave signals are selected such that the frequency components of relatively high magnitude are substantially the same in magnitude, and spaced from each other in the frequency spectrum in a predetermined manner. | 12-24-2009 |
20090325515 | BEAMFORMING AND/OR MIMO RF FRONT-END - An RF front-end includes a transmit adjust module, a PA module, an antenna coupling circuit, a LNA module, and a receive adjust module. The transmit adjust module adjusts coordinates of up-converted analog signals when in a first transmit mode and adjusts coordinates of a plurality of up-converted analog signals when in a second transmit mode to produce to produce multiple adjusted up-converted signals and a plurality of adjusted up-converted signals, respectively, which are subsequently amplified by the PA module. The antenna coupling circuit provides the multiple or the plurality of outbound RF signals to at least some of a plurality of antennas depending on the transmit mode and provides multiple or a plurality of inbound RF signals at least some of the plurality of antennas to the LNA module based on a receive mode. The receive adjust module adjusts coordinates of the multiple or plurality of amplified inbound RF signals based on the receive mode. | 12-31-2009 |
20100056084 | Frequency Conversion Based on Gated Information Signal - A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In a first modulation embodiment, one information signal is phase modulated onto the carrier signal as part of the up-conversion process. In a second modulation embodiment, two information signals are multiplied, and, as part of the up-conversion process, one signal is phase modulated onto the carrier and the other signal is amplitude modulated onto the carrier. In a third modulation embodiment, one information signal is phase modulated onto the “I” phase of the carrier signal as part of the up-conversion process and a second information signal is phase modulated onto the “Q” phase of the carrier as part of the up-conversion process. In a fourth modulation embodiment, four information signals are phase and amplitude modulated onto the “I” and “Q” phases of the carrier as part of the up-conversion process. There are at least two implementations of each of the aforementioned embodiments. | 03-04-2010 |
20100167669 | DISCRETE FILTER, SAMPLING MIXER, AND RADIO DEVICE - Provided is a discrete filter capable of adjusting the number of notches and the notch frequency and easily eliminating a particular frequency component. In a sampling mixer ( | 07-01-2010 |
20100240330 | DIGITAL SIGNAL PROCESSING DEVICE AND RADIO COMMUNICATION APPARATUS - A digital signal processing device includes: a memory for coefficient storage including partial memories that dividedly store, for each plurality of bits, a plurality of filter coefficients as divided data; a control unit that outputs, to the memory for coefficient storage, an address signal added with activation/inactivation control information; a CE-signal interrupting unit that transmits the CE signals to the partial memories or interrupts the CE signals based on the activation/inactivation control information; an output selecting unit that is provided in at least a part of the partial memories and selects and outputs, based on the activation/inactivation control information, an output of the partial memory or all-bit zero value; a multiplier that performs multiplication of each of a plurality of input data and each of the filter coefficients including the output of the output selecting unit; and an integration circuit system that integrates multiplication results output from the multiplier. | 09-23-2010 |
20100261443 | MULTIPLE FREQUENCY BAND INFORMATION SIGNAL UNIVERSAL FRONT END WITH ADJUSTABLE ANALOG SIGNAL PATH COMPONENTS - A wireless device includes processing circuitry, a receiver section, a transmitter section, and an antenna. The processing circuitry determines a set of information signals of a RF Multiple Frequency Bands Multiple Standards (MFBMS) signal. The receiver section down-converts a portion of the RF MFBMS signal by one or more respective shift frequencies to produce a corresponding baseband/low Intermediate Frequency (BB/IF) information signal from which the processing circuitry extracts data. The transmitter section converts a respective BB/IF information signal received from the processing circuitry by a respective shift frequency to produce a corresponding RF information signal and a combiner that combines the RF information signals to form a RF MFBMS signal. Each of the receiver section and the transmitter section may include analog signal path elements that are adjustable based upon characteristics of the RF MFBMS signal, the BB/IF MFBMS signal, and/or based upon signals carried therein, e.g., modulation type, SNR requirements, etc. | 10-14-2010 |
20100311362 | Gain compensation device over temperature and method thereof - A gain compensation device for adjusting gain of an amplifier over temperature is disclosed. The gain of the amplifier is controlled by signals on a gain control end of the amplifier. The gain compensation device comprises a temperature compensation generator, an adder, and a temperature sensor. The temperature compensation generator is for generating an additional gain parameter according to a reference temperature, a current temperature, and a temperature coefficient. The adder comprises a first input end, coupled to the temperature compensation generator for receiving the additional gain parameter, a second input end for receiving a default gain parameter, and an output end coupled to the gain control end of the amplifier for outputting sum of the additional gain parameter and the default gain parameter. The temperature sensor is for providing the current temperature. | 12-09-2010 |
20100323643 | FREQUENCY SYNTHESIS - A frequency synthesiser ( | 12-23-2010 |
20110092174 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING SIGNAL - A signal transmitting apparatus includes a signal distributor, a frequency converter, and a frequency synthesizer. The signal distributor is configured to baseband signals corresponding respectively to a plurality of frequency band. The frequency converter is configured to convert each of the distributed baseband signals into one of a positive frequency signal and a negative frequency signal according to the frequency band. The frequency synthesizer is configured to synthesize the positive frequency signal and the negative frequency signal to generate a transmission signal. Herein, the positive frequency signal and the negative frequency signal are signals included in one predetermined intermediate frequency band. | 04-21-2011 |
20110105057 | HARMONIC GENERATION OF A FUNDAMENTAL FREQUENCY SYSTEM AND METHOD - A system and method for generating for efficiently obtaining a desired harmonic from a fundamental frequency the prior art is needed. The system and method of the present invention produces a desired harmonic by employing techniques using gain stages (or limiter/comparator circuits) in combination with pre-defined offset voltages (or currents). The output signals of the gain stages are added with the correct phase to generate the desired harmonic. | 05-05-2011 |
20110189965 | Differential to Single-Ended Converter - Embodiments enable a multi-band transmitter with significantly reduced architecture area by allowing maximum reuse of transmitter stages across supported frequency bands and signal standards. Further, embodiments allow a monolithic transmitter implementation by providing an integration-friendly differential to single-ended conversion stage. According to embodiments, the differential to single-ended conversion stage is readily configurable according to the frequency band and signal standard of operation of the transmitter. | 08-04-2011 |
20120046004 | High performance transmitter preamplification chain with calibration feedback - According to one embodiment, an improved preamplification chain for implementation in a transmitter comprises a frequency conversion stage for up-converting a baseband signal to a transmit signal, a variable gain control power amplifier driver for preamplifying the transmit signal, and a differential feedback calibration stage receiving first and second differential outputs of a current steering unit of the power amplifier driver and providing calibration feedback to a baseband signal generator of the transmitter. In one embodiment, the frequency conversion stage includes an adjustable low-pass filter for filtering the baseband signal, a passive mixer for up-converting the baseband signal to the transmit signal, and a clock conversion unit configured to convert a fifty percent (50%) duty cycle clock input to a twenty-five percent (25%) duty cycle clock output for driving the passive mixer. | 02-23-2012 |
20120071117 | METHOD FOR TRANSMITTING MAGNETIC RESONANCE SIGNALS WITH DOUBLE FREQUENCY CONVERSION - Front bandpass filters that are essentially transmissive only between a minimum frequency and a maximum frequency filter the magnetic resonance signals. Front frequency mixers mix output signals of each of the bandpass filters with a front LO frequency that is standard for all the magnetic resonance signals. Rear bandpass filters that are essentially transmissive only around a front intermediate frequency filter the output signals of the front frequency mixers. Rear frequency mixers mix output signals of each of the rear bandpass filters with a respective constant rear LO frequency. Frequency filters that are transmissive for frequencies in the range of the difference of the rear LO frequency that is supplied to the rear frequency mixer arranged upstream thereof and the front intermediate frequency filter the output signals of the rear frequency mixers. Output signals of the frequency filters are combined into a common signal, which is transmitted onward. | 03-22-2012 |
20120108188 | SYSTEMS AND METHODS FOR IMPROVED POWER YIELD AND LINEARIZATION IN RADIO FREQUENCY TRANSMITTERS - In one example system, the system comprises a linearizer module, a first upconverter module, a power amplifier module, a signal sampler module, and a downconverter module. The linearizer module may be configured to receive a first intermediate frequency signal and to adjust the first intermediate frequency signal based on a reference signal and a signal based on a second intermediate frequency signal. The first upconverter module may be configured to receive and up-convert a signal based on the adjusted first intermediate frequency signal to a radio frequency signal. The power amplifier module may be configured to receive and amplify a power of a signal based on the radio frequency signal. The signal sampler module may be configured to sample a signal based on the amplified radio frequency signal. The downconverter module may be configured to receive and down-convert a signal based on the sampled radio frequency signal to the second intermediate frequency signal. | 05-03-2012 |
20120157017 | RF TRANSMITTER AND INTEGRATED CIRCUIT WITH PROGRAMMABLE BASEBAND FILTERING AND METHODS FOR USE THEREWITH - A radio frequency (RF) transmitter includes a transmitter processing module that generates a processed signal and a modulating signal based on outbound data. An up-conversion module up-converts the processed signal to generate an up-converted signal. A programmable filter module generates a first plurality of delayed signals from the up-converted signal and that generates a filtered up-converted signal by combining the up-converted signal and the first plurality of delayed signals, wherein a delayed signal of the first plurality of delayed signals is scaled based on one of a first plurality of coefficients, wherein the first plurality of coefficients are selected based on a control signal. A polar amplifier amplifies and amplitude modulates the filtered up-converted signal based on the modulating signal to generate a transmit signal. A processing module generates the control signal to attenuate at least one RF spur of the up-converted signal. | 06-21-2012 |
20120178390 | FILTER CIRCUIT, WIRELESS TRANSMITTER, AND WIRELESS RECEIVER - According to one embodiment, a radio transmitter comprises a passive mixer that mixes the radio-frequency signal and a local oscillation signal, and outputs a mixed signal to the frequency response device, thereby shifting the frequency characteristic of the frequency response device to high frequency by a local oscillation frequency of the local oscillation signal and applying the frequency characteristic shifted to high frequency on the radio-frequency signal. | 07-12-2012 |
20120220246 | CARRIER RECOVERY IN RE-MODULATION COMMUNICATION SYSTEMS - A communication apparatus includes transmission circuitry and a frequency conversion unit. The transmission circuitry is configured to down-convert an input Intermediate Frequency (IF) signal using a transmit (TX) Local Oscillator (LO) signal so as to produce a TX baseband signal, to up-convert the TX baseband signal to produce an output Radio Frequency (RF) signal, and to send the output RF signal to an antenna. The frequency correction unit is configured to estimate a frequency of the TX baseband signal or of the input IF signal, and to adjust the TX LO signal based on the estimated frequency so as to cause the transmission circuitry to down-convert the input IF signal to a predefined target frequency. | 08-30-2012 |
20120238226 | DATA TRANSMISSION COEXISTENCE USING CONSTANT SYMBOL DURATION WITHIN TELEVISION WHITE SPACE CHANNELS - Methods, systems, and/or devices are provided that permit data transmissions over unused television channels. An unused channel within a television broadcast frequency spectrum is first identified. A downclocked waveform (for data transmission) is then generated by applying a factor to a clock that causes a waveform bandwidth to be reduced from a first bandwidth to a second bandwidth, wherein the second bandwidth of the downclocked waveform is less than a channel bandwidth for the identified unused channel. The downclocked waveform may then be configured so that it coexists with a larger waveform having a third bandwidth that is greater than the channel bandwidth. The downclocked waveform is then wirelessly transmitted from the transmitter device over the identified unused channel. | 09-20-2012 |
20130122835 | UP-CONVERSION BASED ON GATED INFORMATION SIGNAL - A method and system is described wherein an information signal is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In a first modulation embodiment, one information signal is phase modulated onto the carrier signal as part of the up-conversion process. In a second modulation embodiment, two information signals are multiplied, and, as part of the up-conversion process, one signal is phase modulated onto the carrier and the other signal is amplitude modulated onto the carrier. In a third modulation embodiment, one information signal is phase modulated onto the “I” phase of the carrier signal as part of the up-conversion process and a second information signal is phase modulated onto the “Q” phase of the carrier as part of the up-conversion process. | 05-16-2013 |
20130178177 | CARRIED RECOVERY IN RE-MODULATION COMMUNICATION SYSTEMS - A communication apparatus includes transmission circuitry and a frequency conversion unit. The transmission circuitry is configured to down-convert an input Intermediate Frequency (IF) signal using a transmit (TX) Local Oscillator (LO) signal so as to produce a TX baseband signal, to up-convert the TX baseband signal to produce an output Radio Frequency (RF) signal, and to send the output RF signal to an antenna. The frequency correction unit is configured to estimate a frequency of the TX baseband signal or of the input IF signal, and to adjust the TX LO signal based on the estimated frequency so as to cause the transmission circuitry to down-convert the input IF signal to a predefined target frequency. | 07-11-2013 |
20140018021 | SIGNAL PROCESSING APPARATUS AND METHOD, RECEIVING APPARATUS AND METHOD, AND, TRANSMITTING APPARATUS AND METHOD - There is provided a signal processing apparatus including an oscillating unit having a division ratio of an integer that performs oscillation at a predetermined oscillation frequency, a frequency transforming unit that transforms a frequency of a signal of a processing target using a signal of the oscillation frequency obtained by the oscillation of the oscillating unit, and a correcting unit that corrects an error of the frequency of the signal of the processing target transformed by the frequency transforming unit based on an error of the oscillation frequency. | 01-16-2014 |
20140030992 | MIXER CIRCUIT - A mixer circuit ( | 01-30-2014 |
20140162577 | MULTIPLIER CIRCUIT AND WIRELESS COMMUNICATION APPARATUS USING THE SAME - A multiplier circuit and wireless communication apparatus that adjust an output level of a desired multiple wave to a desired range is provided. The multiplier circuit includes a multiple wave output unit configured to receive an input signal of a predetermined frequency, to output a multiple wave that is a predetermined multiple of the input signal, and control harmonic distortion associated with the output of the multiple wave based on a gate-source voltage; and a controller configured to adjust the gate-source voltage. | 06-12-2014 |
20140308909 | Up-Conversion Based on Gated Information Signal - A method and system is described wherein an information signal is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In a first modulation embodiment, one information signal is phase modulated onto the carrier signal as part of the up-conversion process. In a second modulation embodiment, two information signals are multiplied, and, as part of the up-conversion process, one signal is phase modulated onto the carrier and the other signal is amplitude modulated onto the carrier. In a third modulation embodiment, one information signal is phase modulated onto the “I” phase of the carrier signal as part of the up-conversion process and a second information signal is phase modulated onto the “Q” phase of the carrier as part of the up-conversion process. | 10-16-2014 |
20150038095 | TRANSMIT ARCHITECTURE FOR WIRELESS MULTI-MODE APPLICATIONS - In one embodiment, an apparatus includes an upconversion unit configured to upconvert a baseband signal to a radio frequency (RF) signal. A plurality of baluns for a plurality of wireless bands are provided. Multiplexing circuitry is coupled to the plurality of baluns where the upconversion unit is coupled to each balun through the multiplexing circuitry. The multiplexing circuitry is configured to multiplex the radio frequency signal from the upconversion unit to one of the plurality of baluns based on a wireless band being used. | 02-05-2015 |
20150147987 | Transmitter with a Reduced Complexity Digital Up-Converter - The present disclosure is directed to a system and method for performing digital up-conversion of a signal to a desired RF carrier frequency. The system and method efficiently perform digital up-conversion of the signal, in one example, by controlling a sample clock that is used by a DAC to sample and convert the up-converted signal from the digital domain to the analog domain to have a frequency that is four or eight times the desired RF carrier frequency. By controlling the sample clock of the DAC to have a frequency that is four or eight times the desired RF carrier frequency, the system and method can be implemented using currently available IC process geometries such that the implementation consumes much less area and/or power than an analog up-converter configured to have equivalent up-conversion functionality. | 05-28-2015 |
20150147988 | MIXER - A frequency shifter configured to shift the frequency of a signal, the frequency shifter comprising: a resonant structure configured to mechanically resonate at a first frequency; and a plurality of capacitors, each capacitor having a variable plate separation distance, wherein the resonant structure is configured to cause the plate separation distance of each capacitor to oscillate so as to cause the frequency of the signal to shift by the first frequency. | 05-28-2015 |
20160149598 | APPARATUS FOR CONVERTING FREQUENCY AND RF TRANSMITTER COMPRISING SAME - Disclosed is an apparatus for converting a frequency. The apparatus includes: an oscillator configured to generate a first oscillation signal having a first oscillation frequency which is obtained by subtracting an input frequency from a carrier frequency of any one carrier signal among a first to a n-th carrier signals (n is a natural number), and generate a second oscillation signal having a second oscillation frequency which is obtained by adding the input frequency to a carrier frequency of any one carrier signal among a (n+1)-th to a 2n-th carrier signals; and a mixer configured to mix and output the first oscillation signal or the second oscillation signal with an input signal having the input frequency. | 05-26-2016 |
20160380592 | FRONT-END ARCHITECTURE FOR TRANSMITTER - Apparatus includes: a mixer configured to mix local a oscillator signal with a baseband signal and output a radio frequency (RF) signal; a first load coupled to the mixer and tuned to an operating frequency; and a second load coupled to the mixer and tuned to a predetermined multiple of the operating frequency. | 12-29-2016 |