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Class Information
Number: 327/555
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific identifiable device, circuit, or system > Unwanted signal suppression > Active filter > Adjustable > Selective type signal filtering (e.g., from low pass to high pass, etc.)
Description: Subject matter wherein different types of signal filtering are selected by an applied control signal.










Patents under this class:

Patent Number Title Of Patent Date Issued
8705675 Device and method for receiving RF signals based on heterodyne architecture using complex IF subsampling Apr. 22, 2014
8674753 Systems and methods for cancelling phase-locked loop supply noise Mar. 18, 2014
8385867 Tracking filter for a television tuner Feb. 26, 2013
8373502 Gm-C filter tuning circuit based on relaxation oscillator Feb. 12, 2013
8005451 Filter circuit and radio communication apparatus Aug. 23, 2011
7785284 Joint for fluid transport lines for medical use Aug. 31, 2010
7764731 Equalizer and semiconductor device Jul. 27, 2010
7587010 Complex filter circuit and receiver circuit Sep. 8, 2009
7511570 Transconductance filtering circuit Mar. 31, 2009
7429889 Control system for programmable filters Sep. 30, 2008
7222056 Method for minimizing the error of a measurable quantity May. 22, 2007
7053697 System for tuning a corner frequency of a low pass filter May. 30, 2006
7002417 RC and SC filter compensation in a radio transceiver Feb. 21, 2006
6894557 Method for tuning a corner frequency of a low pass filter May. 17, 2005
6791400 Frequency-tuning loop used in the transconductor-capacitor filter Sep. 14, 2004
6784728 Low noise switched low pass filter with benign transients Aug. 31, 2004
6741120 Low power active filter and method May. 25, 2004
6703816 Composite loop compensation for low drop-out regulator Mar. 9, 2004
6700360 Output stage compensation circuit Mar. 2, 2004
6674320 System and method for orthogonal inductance variation Jan. 6, 2004
6670846 Semiconductor integrated circuit including a filter with adjustable cut-off frequency Dec. 30, 2003
6642781 Selectable equalization system and method Nov. 4, 2003
6594613 Adjustable bandwidth filter for process variable transmitter Jul. 15, 2003
6469574 Selectable equalization system and method Oct. 22, 2002
6448846 Controlled phase-canceling circuits/systems Sep. 10, 2002
6271778 High pass filtering with automatic phase equalization Aug. 7, 2001
6133783 Phase jitter canceller Oct. 17, 2000
6104235 Integrated circuit with trimmable passive components Aug. 15, 2000
5815033 Integrated circuit, variable filter adjusting method therefor, and electronic equipment using the same Sep. 29, 1998
5751184 Low electrical power consumption filter circuit May. 12, 1998
5719792 Isolator Feb. 17, 1998
5703523 Filter circuit Dec. 30, 1997
5694419 Shared resource modulator-demodulator circuits for use with vestigial sideband signals Dec. 2, 1997
5673003 Amplifier circuit having a variable bandwidth Sep. 30, 1997
5642003 Power system switch incorporating a positive-sequence fundamental signal magnitude detector Jun. 24, 1997
5469087 Control system using harmonic filters Nov. 21, 1995
5317217 Universal active filter May. 31, 1994
5317216 Active filter circuit May. 31, 1994
4963773 Low pass/high pass filter phase shifter Oct. 16, 1990
4893035 Cascaded low pass/high pass filter phase shifter system Jan. 9, 1990
4877979 Filter arrangement Oct. 31, 1989
4857778 Programmable universal active filter Aug. 15, 1989
4847523 Lock-in test amplifier Jul. 11, 1989
4739189 Rapid slewing filter Apr. 19, 1988
4659995 Active fourth-degree filter element Apr. 21, 1987
4540946 Variable characteristic filters Sep. 10, 1985
4516078 Variable frequency passband circuit May. 7, 1985
3974399 Active high Q filter using transistor Aug. 10, 1976











 
 
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