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8159286 |
System and method for time-to-voltage conversion with lock-out logic
An event time stamping system comprising a current source, an integrator comprising an input and an output, and configured to output a voltage proportional to the length of time the current source...
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8154336 |
Method and apparatus for reducing interference
A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a...
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8125262 |
Low power and low noise switched capacitor integrator with flexible input common mode range
An integrator is described that may include a level-shifting capacitor, a feedback capacitor, a pre-amplifier stage and a multi-path amplifier module. The integrator may have inputs for connected...
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8064508 |
Equalizer with controllably weighted parallel high pass and low pass filters and receiver including such an equalizer
An adjustable equalizer that includes a first branch including a low pass filter (LPF) and having a variable gain (β), and a second branch including a high pass filter (HPF) and having another ...
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8030992 |
Low-pass filter
A low-pass filter of the present invention comprises a plurality of filter units and a regulation unit. The filter units are coupled in series with each other and receive an input signal to filter...
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8018273 |
Filter circuit
A filter circuit that removes high-frequency components from an input signal, comprises: an operational amplifier; a first resistor connected between a non-inverting input terminal of the...
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8013657 |
Temperature compensated integrator
A representative integrator includes an amplifier having an input and an output; a feedback loop coupled between the input and the output of the amplifier, the feedback loop comprising a...
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7986181 |
Calibration circuit for an adjustable capacitance
A calibration circuit for calibrating an adjustable capacitance of a circuit having a time constant depending on the adjustable capacitance, the calibration circuit generating a calibration signal...
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7982533 |
Transceiving system and compound filter
A transceiving system utilizing a shared filter module is provided. The shared filter module is selectively filtering signals in a first band in a first mode and a second band in a second mode. The...
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7973568 |
System for providing large RC time constants in integrated circuits
A peak detector for implementation in a monolithic integrated circuit includes one or more Miller capacitors and one or more transistors for selectively setting large RC time constant values only...
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7948306 |
Active power filter method and apparatus
This disclosure provides active power filter methods and apparatus to control the PF, harmonics and/or ripple current associated with powering electrical devices. According to one exemplary aspect,...
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7932774 |
Structure for intrinsic RC power distribution for noise filtering of analog supplies
A design structure for intrinsic RC power distribution for noise filtering of analog supplies. The design structure is embodied in a machine readable medium for designing, manufacturing, or testing...
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7915952 |
Semiconductor integrated circuit
In a semiconductor integrated circuit, a switching circuit controls the capacity of a capacitor unit based on a control signal from a control circuit and separates a resonant frequency determined...
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7907924 |
Semiconductor device interconnecting unit, semiconductor device and high-frequency module having a millimeter wave band
A semiconductor device interconnecting unit configured to input/output a high-frequency signal having a millimeter wave band to/from a semiconductor device is provided. The semiconductor or device...
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7902917 |
Current-input current-output reconfigurable passive reconstruction filter
Embodiments of the present invention relate generally to reconstruction filtering. In particular, embodiments enable highly linear, highly programmable, and easily reconfigurable reconstruction...
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7893746 |
High speed intra-pair de-skew circuit
For differential signal transmission (especially in high speed applications), intra-pair skew between paths carrying complementary portions of a differential signal can significantly affect...
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7884666 |
Method and apparatus for reducing interference
A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a...
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7884662 |
Multi-channel integrator
A multi-channel integrator includes a first switch, a second switch, and a plurality of integration units. First terminals of the first and second switches receive a first reference voltage. Each...
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7880536 |
Simplified sallen-key low-pass filter circuit
Circuits, methods and devices for providing low-pass filtering are implemented according to a number of different embodiments. In one such embodiment a Sallen-Key low-pass filter circuit is...
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7876148 |
Low pass filter and lock detector circuit
A low pass filter includes a driver unit configured to output a voltage proportional to an input pulse width, a charge/discharge unit configured to charge the output voltage of the driver unit, a...
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7868688 |
Leakage independent very low bandwith current filter
A current filter circuit is provided. The current filter circuit comprises a source transistor comprising a drain, a gate, and a source. The source of the source transistor is coupled to a...
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7830197 |
Adjustable integrator using a single capacitance
An integrating amplifier on an IC, which comprises a feedback loop using an external device as an integrating capacitor, has added a second feedback loop that provides an additional current to the...
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7813710 |
Receiving circuit
The present invention is a receiving circuit used for a cellular phone that is reduced in size and can realize low power consumption. In a signal reception circuit that is used in a cellular phone...
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7800435 |
Audio filter using a diode connected MOSFET
A diode connected P-type CMOS transistor is operated in the sub-threshold area and, with a bypass capacitor, operates as a low pass audio filter. The equivalent resistance of the CMOS transistor in...
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7800434 |
Edge detect receiver circuit
A digital signal detector detects digital signals by only sensing the rising and falling edges of a received digital signal and latches the logic state between the detected edges. Such edges...
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7795956 |
Multi format video filter design
Current generation digital media processors support multi-format video resolutions, SDTV, Progressive Scan and HDTV. Built-in video encoders directly support NTSC and progressive 480P video...
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7795957 |
Power supply circuit for south bridge chip
A power supply circuit for a south bridge chip includes a voltage conversion chip having a first voltage input terminal, a second voltage input terminal, a driving voltage output terminal, and a...
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7782127 |
Multi-mode reconstruction filter
A circuit (e.g., a reconstruction filtering circuit) may include a single operational amplifier (op-amp) that is arranged to receive a voltage input and that is arranged to have a biasing of...
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7764116 |
Cutoff frequency adjusting method, GmC filter circuit and semiconductor device
A cutoff frequency adjusting method adjusts a cutoff frequency of a GmC filter circuit which has a capacitor and an Operational Transconductance Amplifier (OTA) circuit with a controllable Gm...
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7760014 |
Lowpass biquad VGA filter
A biquad gain stage, as well as a Variable Gain Amplifier is disclosed. The biquad gain stage comprises a plurality of transistors as well as conductances, and capacitances, as well as current...
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7755411 |
DC current reduction circuit
A DC current reduction circuit of the present invention that reduces a DC component in an output current of a current output element in which an AC current and a DC current are superimposed...
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7755420 |
Intrinsic RC power distribution for noise filtering of analog supplies
Analog supply for an analog circuit and process for supplying an analog signal to an analog circuit. The analog supply includes a noise filter having a variable resistor, and a control device...
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7750741 |
PLL circuit and semiconductor device
A PLL circuit has a phase comparator to receive an input signal and a feedback signal, a charge pump controlled by an output of the phase comparator, a lowpass filter part to receive an output of...
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7742893 |
Calibration circuit for calibrating an adjustable capacitance of an integrated circuit having a time constant depending on said capacitance
A calibration circuit calibrates an adjustable capacitance of a circuit having a time constant depending on the adjustable capacitance. The calibration circuit outputs a calibration signal carrying...
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7705665 |
Digital tuning circuit of GM-C filter
Provided is a tuning circuit of a Gm (transconductance)-C (capacitance) filter. The tuning circuit tunes a transconductance using direct current incorporating variations of a capacitance, instead...
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7683704 |
Multiple order low pass filter for an xDSL splitter in a telecommunication system
A single-ended low pass filter and its double-ended or balanced version comprising a first coil (Lp1) coupled between a first input (Vin1) and a first output (Vout1) terminal of the filter, a...
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7679431 |
Low flicker noise mixer and buffer
Low flicker noise mixer and buffer. This design employs some native metal oxide semiconductor field-effect transistors (MOSFETs) (e.g., having no threshold voltage) within a passive mixer whose...
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7675356 |
Digital controlled filter system and filtering method
A filter system and filtering method includes a subtractor which receives an analog input signal and a reference voltage as a first input, and an analog feedback signal, supplied through a feedback...
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7649408 |
Loop filters
Loop filters are provided, in which a first resistor comprises a first terminal coupled to a first node, and a second terminal coupled to a second node; a first capacitor is coupled between the...
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7642824 |
PLL circuit and method of controlling the same
A PLL circuit includes a phase detector that compares the phase of an input clock with the phase of a feedback clock so as to generate pull-up and pull-down control signals. A low pass filter pumps...
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7619465 |
filter circuit and semiconductor device
A filter circuit includes a low-pass filter and a calibration circuit calibrating a frequency characteristic of the low-pass filter. The calibration circuit includes a negative feedback circuit and...
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7619452 |
Mutual charge cancelling sample-reset loop filter for phase locked loops
In general, in one aspect, an apparatus includes a phase frequency detector, a charge pump, a voltage controlled oscillator, an integral capacitor to maintain an integral charge and provide an...
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7609108 |
Phase-locked loop and compound MOS capacitor thereof
Compound MOS capacitors and phase-locked loop with the compound MOS capacitors are disclosed. In the phase-locked loop, the compound MOS capacitors of the loop filter are HV (high voltage) devices,...
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7596195 |
Bandpass filter with reversible IQ polarity to enable a high side or low side injection receiver architecture
The invention enables a reversing IQ polarity in a bandpass filter so that the bandpass filter can filter signals with high side or low side injection.
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7592864 |
High-order low-pass filter circuit and method
A low-pass filtering circuit and method are disclosed. The circuit includes a low-pass filter with a capacitor, and a multiplier configured to multiply the capacitance of the capacitor by...
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7564301 |
Apparatus for adjusting frequency characteristic and Q factor of low pass filter and method thereof
Provided are an apparatus for adjusting frequency characteristic and Q factor of a low pass filter (LPF) and a method thereof. The apparatus includes: a frequency comparing unit for calculating a...
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7547956 |
Thick oxide P-gate NMOS capacitor for use in a low-pass filter of a circuit and method of making same
A circuit with dielectric thicknesses is presented that includes a low-pass filter including one or more semiconductor devices having a thick gate oxide layer, while further semiconductor devices...
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7535289 |
Integrated RC filter
An integrated RC filter comprises a first resistor being coupled to a first capacitor through a first node and a signal input of said integrated RC filter is coupled through one of the first...
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7511570 |
Transconductance filtering circuit
A transconductance filtering device with a flexible architecture that can selectively present a different topology and/or order beginning with the same initial structure is disclosed. For example,...
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7504879 |
Transconductor and filter circuit
A transconductor and filter circuit is described. In one embodiment, a front end module within the transconductor and filter circuit converts a differential input voltage signal into a differential...
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