Patent application number | Description | Published |
20080224795 | ACTIVE BALUN - An active balun for improving a phase matching characteristic includes a transistor part which has an input terminal receiving an input signal and first and second output terminals which output signals corresponding to the input signal, and a capacitance matching part provided on the side of one of the first and second output terminals which matches capacitances as seen from the first and second output terminals. The capacitance matching part may be composed of a transistor which bleeds a current from the one output terminal. | 09-18-2008 |
20100237953 | DIGITAL PHASE DETECTOR, AND DIGITAL PHASE LOCKED LOOP INCLUDING THE SAME - A digital phase detector includes a quantization unit that quantizes a frequency of a reference signal to generate reference delay information and reference integer phase information, and quantizes a frequency of an oscillation signal to generate oscillation delay information and oscillation integer phase information. A first conversion unit converts the frequency of the reference signal into reference frequency information based upon the reference delay information and the reference integer phase information. A second conversion unit converts the frequency of the oscillation signal into oscillation frequency information based upon the oscillation delay information and the oscillation integer phase information. A calculation unit converts the reference frequency information and the oscillation frequency information into first and second phase information, respectively, and outputs a digital phase difference between the first phase information and the second phase information. | 09-23-2010 |
20100316174 | DISCRETE TIME FILTER AND RECEIVER INCLUDING THE SAME - A discrete time filter includes a plurality of sampling cells and a first dummy sampling cell. Each of the sampling cells performs a current mode sampling operation based on current input to an input terminal in response to a corresponding one of a plurality of sampling clock signals and is reset in response to a corresponding one of the plurality of sampling clock signals and a first dummy sampling clocks. The first dummy sampling cell alternately performs with the first sampling cell the current mode sampling operation based on current input to the input terminal in response to the first dummy sampling clock signal and is alternately reset with the first sampling cell in response to the first sampling clock signal. | 12-16-2010 |
20110018589 | BOOTSTRAPPED CLOCK GENERATOR AND TRACK-AND-HOLD CIRCUIT INCLUDING THE SAME - A track-and-hold circuit includes a bootstrapped clock generator and a track-and-hold unit. The bootstrapped clock generator receives an input voltage signal and generates a sampling control signal having a voltage level lower than or equal to a level of a power supply voltage by maintaining an initial level of a boost capacitor voltage at a level lower than the level of the power supply voltage. The boost capacitor voltage is a voltage that is charged across a boost capacitor included in the bootstrapped clock generator and the sampling control signal is generated based on a clock signal. The track-and-hold unit samples and holds the input voltage signal in response to the sampling control signal to generate a sampled signal. | 01-27-2011 |
20110018751 | FOLDING ANALOG-TO-DIGITAL CONVERTER - A folding analog-to-digital converter including: a reference voltage generator, a track-and-hold circuit and a first pre-amplification circuit. The reference voltage generator generates a plurality of reference voltages. The track-and-hold circuit generates a sampling control signal having a voltage level lower than or equal to a level of a power supply voltage by maintaining an initial level of a boost capacitor voltage at a level lower than a level of a power supply voltage, and samples and holds an input voltage signal in response to the generated sampling control signal to generate a sampled signal. The first pre-amplification circuit amplifies each of voltage differences between the sampled signal and each of the plurality of reference voltages. | 01-27-2011 |
Patent application number | Description | Published |
20090096557 | Variable Inductance Applying Device Using Variable Capacitor and Variable Frequency Generating Device Thereof - Disclosed is a variable inductance applying device using a variable capacitor, and a variable frequency generating device thereof. The variable inductance applying device includes: a first inductor whose both terminals are connected to an inductance applying terminal applying inductance to an external circuit; a second inductor inductively coupled to the first inductor; and a variable capacitor connected to both terminals of the second inductor, which varies inductance from the inductance applying terminal by changing capacitance. Therefore, the inductance to be applied to the external circuit can be varied by changing the capacitance of the variable capacitor. Since the variable capacitor rarely contains a resistance component, energy loss due to the resistance component hardly occurs. As a result, the variable inductance applying device has a high value of Q. | 04-16-2009 |
20090102572 | PARALLEL-STRUCTURED SWITCHED VARIABLE INDUCTOR CIRCUIT - An inductor circuit includes a pair of inductors connected in parallel with each other and a switch for turning on and off electric power to one of the pair of inductors. The inductance of the inductor circuit can be varied and the quality factor Q can be improved. Further, RF circuits employing the inductor circuit can generate an intended operating frequency. | 04-23-2009 |
20090212861 | LOW NOISE AMPLIFIER - A low noise amplifier is provided. The low noise amplifier includes: a low noise amplifying unit amplifying an input signal; a harmonic and noise generating unit disposed in an input terminal of the low noise amplifying unit, for generating a compensating signal for compensating for an intermodulation distortion signal and a thermal noise signal of the input signal to the low noise amplifying unit; and a load unit outputting the amplified input signal generated by the low noise amplifying unit. | 08-27-2009 |
20090215421 | RF RECEIVER AND METHOD OF RECEIVING RF SIGNAL - A radio frequency (RF) receiver and a method of receiving an RF signal are provided. The RF receiver includes a low-noise amplifying unit which amplifies a received signal while restricting out-of-band interferer of the received signal, a sampling unit which performs sampling to convert the amplified signal to a discrete time domain signal, a frequency translation unit which down-converts the sampled signal into a frequency band that enables the sampled signal to be converted into a digital signal and restricts interferer from a frequency within an aliasing band according to a sampling frequency, an anti-aliasing filtering unit which prevents aliasing from the down-converted signal, a clock unit which provides the sampling unit, the frequency translation unit, and the anti-aliasing filtering unit with sampling frequencies, and an analog-digital-converter which converts the converted signal into the digital signal. | 08-27-2009 |