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7629854 Switch-capacitor loop filter for phase lock loops  
A switch-capacitor loop filter is used to generate a control voltage for a voltage-controlled oscillator (VCO) in a phase lock loop (PLL). The switch-capacitor circuit works in a multi-phase manner...
7622980 Switched capacitor circuit capable of minimizing clock feedthrough effect and having low phase noise and method thereof  
A switched capacitor circuit includes a positive side capacitor coupled to a first positive side node; a first positive side switch element for selectively coupling the first positive side node to...
7595678 Switched-capacitor circuit  
A low-power switched-capacitor circuit is disclosed. The low-power switched-capacitor circuit includes a p-channel switched-capacitor integrator and an n-channel switched-capacitor integrator. The...
7592878 Method and apparatus for generating oscillating signals  
An apparatus for generating an oscillating signal that includes a circuit to accelerate the time in which an oscillating signal reaches a defined steady-state condition from a cold start. The...
7583127 High Q linear controlled variable capacitor using translinear amplifier  
A voltage controlled variable capacitor, formed of a larger number of fixed capacitor segments and a corresponding number of switching elements, uses translinear amplifiers to control each...
7583166 Inductor Q factor enhancement apparatus has bias circuit that is coupled to negative resistance generator for providing bias signal  
The present invention provides an apparatus for enhancing Q factor of an inductor. The apparatus includes a negative resistance generator coupled to the inductor for providing a negative...
7564273 Low-voltage comparator-based switched-capacitor networks  
Described is a switched-capacitor network and method for performing an analog circuit function. The circuit includes a switched-capacitor network, a comparator, and a voltage-offset network. The...
7518413 Current detection circuit  
An upper end voltage and a lower end voltage of a current detection resistor Rs are supplied, via first and second switches S 1 and S 2 , to one end of a main capacitor Ci. A reference voltage...
7511549 Compact high-speed, high-resolution comparator structure  
Methods and circuits for performing high-speed, high-resolution signal comparisons using offset cancellation, reduction of charge injection noise, and sharing of coupling capacitors between circuit...
7504866 Output hold circuits for sample-data circuits  
A sampled-data analog circuit uses zero-crossing detector. A waveform generator produces a plurality of segments of ramp at the output. An output of a zero crossing detector controls a sampling...
7479810 Slew-rate detection circuit using switched-capacitor comparators  
In general, in one aspect, the disclosure describes an apparatus that includes a first switched capacitor comparator to be charged to a first reference voltage and to compare an input signal to the...
7477087 Switch-capacitor techniques for level-shifting  
In one embodiment, a circuit comprises at least first and second circuit stages, at least one level shifting circuit, and a control circuit. The first circuit stage is configured and arranged to...
7439777 Double feedback rotary traveling wave oscillator driven sampler circuits  
A sampling circuit and method are disclosed. The sampling circuit includes a buffer, a holding capacitor, a set of switches, and at least two voltage references. The buffer drives buffered analog...
7423458 Multiple sampling sample and hold architectures  
A sample and hold circuit architecture samples using two capacitors that are cyclically switched between charge and discharge modes. The sample and hold circuit includes a buffer to receive an...
7411444 Technique for improving antialiasing and adjacent channel interference filtering using cascaded passive IIR filter stages combined with direct sampling and mixing  
A technique of improving antialiasing and adjacent channel interference filtering uses cascaded passive IIR filter stages combined with direct sampling and mixing. The methodology and related...
7394309 Balanced offset compensation circuit  
Balanced offset compensation is provided for a differential amplifier circuit. Two sets of three switches are employed between respective inputs and outputs of the differential amplifier to shunt...
7365588 Automatic time constant adjustment circuit  
An automatic time constant adjustment circuit has an error detection circuit and a variable time constant circuit. The error detection circuit detects, based on the resistance of an error reference...
7332951 Switched capacitor circuit capable of minimizing clock feedthrough effect and having low phase noise and method thereof  
A switched capacitor circuit includes a positive side capacitor coupled to a first positive side node; a first positive side switch element for selectively coupling the first positive side node to...
7327182 Switched capacitor filter and feedback system  
A switched capacitor filter comprises three switched capacitor circuits. Each switched capacitor circuit has a capacitance. A first state that the capacitance is connected to an input end of a...
7315200 Gain control for delta sigma analog-to-digital converter  
Gain control for delta sigma analog-to-digital converter. A method is disclosed for driving the input of an integrator in a delta-sigma converter having an amplifier with a non-inverting input, an...
7279940 Switched-capacitor circuit with time-shifted switching scheme  
A switched-capacitor circuit for sampling a pair of differential input signals includes a first bootstrapped switch and a first non-boosted switch connected in parallel between a first output...
7268607 Integrating capacitance circuitry for an integrating amplifier and related method  
An integrating capacitor circuit for an integrating amplifier and related methods are disclosed that allow for efficient detection of currents or charges, particularly those produced by pixel cells...
7224203 Analog voltage distribution on a die using switched capacitors  
In an embodiment, a switched capacitor transformer transfers a differential reference voltage at its input ports to its output ports, where a capacitor is switched so that the capacitor is coupled...
7157956 Switched capacitor input circuit and method therefor  
A switched capacitor input circuit ( 200 ) includes an input buffer ( 210 ), a switched capacitor sampler circuit ( 220 ), and an integrator ( 250 ). The input buffer ( 210 ) has an input terminal...
7157955 Switched capacitor sampler circuit and method therefor  
A switched capacitor sampler circuit ( 220 ) includes an input terminal ( 224 ) for receiving an input voltage, an output terminal ( 226 ), a capacitor ( 222 ) having first and second terminals,...
7148727 Read-out circuit for infrared detectors  
The present invention is related to a device comprising a capacitive feedback transimpedance operational amplifier, that comprises a main operational amplifier (with a first input, a second input...
7142037 Switched capacitor mutual charging system and method  
A system and method for mutually charging switched capacitors in a switched capacitor system includes operating first and second sets of output switches during separate phases; operating first and...
7142036 Amplifier compensation techniques for switched capacitor circuits  
A system and method are used to maintain a variance in feedback factors of an amplifier between the first and second phases either below a threshold value or within a specified range. The system...
7138848 Switched capacitor integrator system  
A switched capacitor integrator system includes an input cascoded amplifier circuit; a summing junction; an integrating switched capacitor circuit connected to the output of the input cascoded...
7132881 Active filter  
In order to reduce capacitance of a feedback section of an operational amplifier provided in a semiconductor integrated device, an active filter includes an operational amplifier in which a...
7123072 High-accuracy capacitor digital-to-analog converter  
A capacitor digital-to-analog converter for N-bit digital-to-analog conversion comprises a converter capacitor network comprising 2 N capacitors and 2 N +1 MOS switches and an output buffer. The...
7116159 Method and apparatus for adjusting an active filter  
An adjustable filter, particularly for use as an antialiasing filter in digital telecommunications networks, includes adjustable capacitors which determine frequency response for the purpose of...
7102557 Switched capacitor DAC  
The present invention relates to digital to analog converters, and especially but not exclusively to switched capacitor digital to analog converters (DACs) for digital audio signals. The present...
7078946 Analog PLL with switched capacitor resampling filter  
A resampler filter for use in an analog phase-locked loop has a charge pump and one or more switched capacitors switched by signals derived from a voltage controlled oscillator in the phase locked...
7075475 Correlated double sampling modulation system with reduced latency of reference to input  
A charge balancing modulation system for digitizing the output of a variable impedance sensor utilizes synchronous excitation of the input sensor and AC coupling of the analog input signal. In one...
7049860 Method and circuit for controlling a resistance of a field effect transistor configured to conduct a signal with a varying voltage  
The present invention relates to a replica network for linearizing switched capacitor circuits. A bridge circuit with a MOSFET resistor disposed in a resistor branch of the bridge circuit is...
7043206 Fully integrated offset compensation feedback circuit  
An offset correction analogic circuit capable of compensating the offset of a digital baseband is described. The circuit comprises analog means to receive an output differential signal issued from...
7038532 Switched-capacitor high-pass mirrored integrator  
In a high-pass (mirrored) integrator structure that employs chopper modulation, the input and output of the mirrored integrator are connected to the input and output ports of the operational...
7034736 Processing systems and methods that reduce even-order harmonic energy  
Differential processing systems are provided that reduce even-order harmonic energy. The reduction may be selectively converted to, for example, random noise. This effects a tradeoff for processing...
7034725 Method for self-calibrating a phase integration error in a modulator  
A method of self-calibrating a modulator includes at least one integrator likely to incur a phase error may include reading a pulse response of the modulator, calculating a phase error parameter of...
7015742 Switched capacitor circuit capable of eliminating clock feedthrough by complementary control signals for digital tuning VCO  
A differential switched capacitor circuit for use in a voltage controlled oscillator (VCO) capable of eliminating clock feedthrough and preventing an unwanted momentary frequency shift and drift in...
7009373 Switched capacitor bandgap reference circuit  
A circuit is provided which is adapted to compensate for the inherent parasitic capacitance which is implicit in switched capacitor circuits. By shielding the parasitic capacitance to a common node...
6992509 Switched-capacitor sample/hold having reduced amplifier slew-rate and settling time requirements  
A switched-capacitor sample/hold circuit and method having reduced slew-rate and settling time requirements provides for lower-cost and/or lower-power implementation of sample/hold circuits and/or...
6973153 Transmit and receive protection circuit  
A transmit and receive protection circuit for use in a communication system is disclosed. The protection circuit uses a four-diode gate in which the currents through an input portion and an output...
6970038 Switching scheme to improve linearity and noise in switched capacitor stage with switched feedback capacitor  
A switch capacitor amplifier using a “bottom plate sampling” type arrangement in the feedback network to mitigate the reduction in linearity due to feedback switch charge injection. The switch...
6967610 Low power bit and one-half analog to digital converter  
A bit-and-one-half analog to digital converter comprises a switched capacitor circuit, including an opamp, that receives an analog input voltage and generates a residual analog output voltage. The...
6967511 Method for synchronizing and resetting clock signals supplied to multiple programmable analog blocks  
A method for establishing frequency and phase alignment of clock signals across a domain of analog blocks coupled in a single integrated circuit. Different analog functions are implemented by...
6949967 Dynamically adjustable decoupling capacitance to reduce gate leakage current  
A new method to reduce switching noise on an integrated circuit device is achieved. The method comprises providing an integrated circuit device comprising a power supply, a ground, and a plurality...
6903602 Calibrated fully differential RC filter  
A calibrated RC filter ( 4 ) includes a fully differential calibration circuit ( 10 ) and finite state machine ( 8 ) for determining processing variations in the resistive and capacitive components...
6897801 High-speed, high-resolution and low-consumption analog/digital converter with single-ended input  
An A/D converter having capacitors of a first array of sampling capacitors weighted in binary code connected between a first common circuit node and an input terminal to be charged to an input...
Matches 1 - 50 out of 259 1 2 3 4 5 6 >