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Class Information
Number: 327/553
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific identifiable device, circuit, or system > Unwanted signal suppression > Active filter > Adjustable
Description: Subject matter wherein some component or parameter of a filter circuit (such as filter resistor, filter capacitor, filter time constant, filter amplifier gain, filter input signal, etc.) is changeable in value by a control circuit signal.










Sub-classes under this class:

Class Number Class Name Patents
327/555 Selective type signal filtering (e.g., from low pass to high pass, etc.) 48
327/554 Switched capacitor filter 360


Patents under this class:
1 2 3 4 5 6 7 8 9 10

Patent Number Title Of Patent Date Issued
8704576 Variable resistance switch for wide bandwidth resonant global clock distribution Apr. 22, 2014
8674753 Systems and methods for cancelling phase-locked loop supply noise Mar. 18, 2014
8674754 Loop filter and phase-locked loop Mar. 18, 2014
8648651 Adaptive filter with coefficient determination based on output of real time clock Feb. 11, 2014
8620251 Electronic device with adjustable filter and associated methods Dec. 31, 2013
8618872 Filter with controlled cut-off frequency step-down Dec. 31, 2013
8610477 Wideband analog phase shifter Dec. 17, 2013
8610442 Systems and methods for detecting capacitor process variation Dec. 17, 2013
8605840 Method to cancel impulsive interference from a signal processing system Dec. 10, 2013
8594592 Transmitter, base station device, and method for aligning signal output from transmitter Nov. 26, 2013
8587371 Electric circuit for reducing energy consumption Nov. 19, 2013
8587461 Data acquisition system with analog-to-digital converter having integrated multiplexer control Nov. 19, 2013
8552797 High accuracy RC calibradion circuit Oct. 8, 2013
8508291 Digitally programmable active-RC filter Aug. 13, 2013
8508290 Interface for MEMS inertial sensors Aug. 13, 2013
8502596 Filter circuitry Aug. 6, 2013
8498606 Data rate tracking filter Jul. 30, 2013
8487693 Self calibrated, broadband, tunable, active oscillator with unity gain cells for multi-standard and/or multiband channel selection Jul. 16, 2013
8482344 Frequency-variable filter Jul. 9, 2013
8482343 Digitally programmable high-order filter Jul. 9, 2013
8482339 Method and apparatus for temperature compensation of filter circuits Jul. 9, 2013
8471642 Resonant circuits Jun. 25, 2013
8456230 Adaptive filter with coefficient determination based on output of real time clock Jun. 4, 2013
8456343 Switched capacitor type D/A converter Jun. 4, 2013
8421530 Filter circuit, integrated circuit including the same, and signal filtering method Apr. 16, 2013
8410962 Active RC resonators with enhanced Q factor Apr. 2, 2013
8405453 Millimeter-wave on-chip switch employing frequency-dependent inductance for cancellation of off-state capacitance Mar. 26, 2013
8385490 Discrete time filter and receiver including the same Feb. 26, 2013
8384574 Reconfigurable bandpass delta-sigma modulator Feb. 26, 2013
8373502 Gm-C filter tuning circuit based on relaxation oscillator Feb. 12, 2013
8362828 Sampling filter using multiple clocks Jan. 29, 2013
8355258 Support method and apparatus for printed circuit board Jan. 15, 2013
8330535 Equalizer and method of equalizing signals Dec. 11, 2012
8314653 Using degeneration in an active tunable low-noise radio frequency bandpass filter Nov. 20, 2012
8274325 Phase-locked loop Sep. 25, 2012
8269551 Complex filter and calibration method Sep. 18, 2012
8264263 Quasi-resonant composite resonance circuit Sep. 11, 2012
8244188 Transmitting and receiving circuit Aug. 14, 2012
8244197 Receiving device and electronic equipment using the same Aug. 14, 2012
8229384 Filter circuit and receiving apparatus Jul. 24, 2012
8143941 Active analog filter having a MOS capacitor device with improved linearity Mar. 27, 2012
8143942 Integrated channel filter using multiple resonant filters and method of operation Mar. 27, 2012
8130021 Gain control with multiple integrators Mar. 6, 2012
8111095 Temperature compensation for internal inductor resistance Feb. 7, 2012
8111096 Variable gain amplifier circuit and filter circuit Feb. 7, 2012
8107574 Filter tuning circuit for wireless communication system Jan. 31, 2012
8076969 Apparatus for attenuating low frequency signals Dec. 13, 2011
8058925 Adaptive temporal filtering of single event effects Nov. 15, 2011
8044712 Circuit and method for improved frequency resolution of wide-bandwidth digitally programmable RC active filters Oct. 25, 2011
8045938 Discrete filter, sampling mixer, and radio device Oct. 25, 2011

1 2 3 4 5 6 7 8 9 10










 
 
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