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Class Information
Number: 327/556
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific identifiable device, circuit, or system > Unwanted signal suppression > Active filter > Notch or bandreject
Description: Subject matter wherein a circuit arrangement attenuates a very narrow band of frequencies of an input signal, but will pass frequencies on either side (i.e., higher and lower frequencies) of the narrow band.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8620978 System and method for filtering electrophysiological signals Dec. 31, 2013
8436679 Low frequency notch filter integrated circuit May. 7, 2013
8416014 Switched capacitor notch filter with fast response time Apr. 9, 2013
8373502 Gm-C filter tuning circuit based on relaxation oscillator Feb. 12, 2013
8058949 Compact RC notch filter for quadrature and differential signaling Nov. 15, 2011
8018272 Filter circuit and communication device Sep. 13, 2011
8005451 Filter circuit and radio communication apparatus Aug. 23, 2011
7999608 Integrated RF notch filters Aug. 16, 2011
7990209 Switched capacitor notch filter Aug. 2, 2011
7843258 Filter circuit Nov. 30, 2010
7778053 Power system having a voltage regulator with a notch filter Aug. 17, 2010
7756500 Active inductor circuits for filtering in a cable tuner circuit Jul. 13, 2010
7610022 Filter circuit with negative transconductance Oct. 27, 2009
7525372 Noise shaped n th order filter Apr. 28, 2009
7511570 Transconductance filtering circuit Mar. 31, 2009
7495508 Switched capacitor notch filter circuits Feb. 24, 2009
7429889 Control system for programmable filters Sep. 30, 2008
7323955 Narrow-band absorptive bandstop filter with multiple signal paths Jan. 29, 2008
7268615 Trap filter Sep. 11, 2007
7127226 Twin-T dual notch filter Oct. 24, 2006
7109786 Biquad notch filter Sep. 19, 2006
7002417 RC and SC filter compensation in a radio transceiver Feb. 21, 2006
6930544 Filter Aug. 16, 2005
6909321 Active isolated-integrator low-pass filter with attenuation poles Jun. 21, 2005
6867642 Realtime adaptive notch compensator Mar. 15, 2005
6803812 Active filter Oct. 12, 2004
6791401 Continuous-time analog filter having controllable gain characteristics Sep. 14, 2004
6677815 Second order active RC filter with imaginary zero Jan. 13, 2004
6608898 Band pass and notch filters for echo reduction with less phase distortion Aug. 19, 2003
6552604 Digitally tuned analog notch filter circuit Apr. 22, 2003
6507239 Low noise and low offset bipolar input amplifiers Jan. 14, 2003
6404279 Band pass filter with improved group delay Jun. 11, 2002
6373332 Biquad notch filter Apr. 16, 2002
6320459 Notch filter implemented using analog sampling Nov. 20, 2001
6271720 Operational filter building block Aug. 7, 2001
6268766 Band pass filter from two notch filters Jul. 31, 2001
6157248 Active filter circuit Dec. 5, 2000
6097244 Highly-linear continuous-time filter for a 3-volt supply with PLL-controlled resistor and digitally-controlled capacitor Aug. 1, 2000
6020783 RF notch filter having multiple notch and variable notch frequency characteristics Feb. 1, 2000
6002297 Digital filter Dec. 14, 1999
5994952 Narrow band-pass interferometric filter having enhanced operational characteristics Nov. 30, 1999
5929700 Increased bandwidth for plants with resonant modes using nonlinear notch filters Jul. 27, 1999
5926063 Method of and apparatus for selectively engaging an internal trap filter and implementing an external trap filter through a single pin Jul. 20, 1999
5751184 Low electrical power consumption filter circuit May. 12, 1998
5729170 Frequency divider Mar. 17, 1998
5694077 Reduced phase-shift nonlinear filters Dec. 2, 1997
5451852 Control system having signal tracking window filters Sep. 19, 1995
5331218 Switched-capacitor notch filter with programmable notch width and depth Jul. 19, 1994
5331299 Adaptive tracking notch filter system Jul. 19, 1994
5298813 Polar leapfrog filter Mar. 29, 1994

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