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Class Information
Number: 327/552
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific identifiable device, circuit, or system > Unwanted signal suppression > Active filter
Description: Subject matter wherein a specified frequency or a range of frequencies of an input signal is passed or blocked by the use of an active device.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7616052 |
Fast adapting filter |
Nov. 10, 2009 |
| 7610022 |
Filter circuit with negative transconductance |
Oct. 27, 2009 |
| 7596195 |
Bandpass filter with reversible IQ polarity to enable a high side or low side injection receiver architecture |
Sep. 29, 2009 |
| 7592863 |
Optimized gain filtering technique with noise shaping |
Sep. 22, 2009 |
| 7592864 |
High-order low-pass filter circuit and method |
Sep. 22, 2009 |
| 7589575 |
Precision integrated phase lock loop circuit loop filter |
Sep. 15, 2009 |
| 7586366 |
Complex filter circuit |
Sep. 8, 2009 |
| 7587010 |
Complex filter circuit and receiver circuit |
Sep. 8, 2009 |
| 7583136 |
Active filter for reduction of common mode current |
Sep. 1, 2009 |
| 7573326 |
Forwarded clock filtering |
Aug. 11, 2009 |
| 7574317 |
Method for calibrating a filter, a calibrator and system including the same |
Aug. 11, 2009 |
| 7570690 |
Adaptive equalizer with a dual-mode active taps mask generator and a pilot reference signal amplitude control unit |
Aug. 4, 2009 |
| 7554388 |
Integrated circuit apparatus |
Jun. 30, 2009 |
| 7546230 |
Electromagnetic response model with improved high frequency stability |
Jun. 9, 2009 |
| 7541863 |
Transferred-impedance filtering in RF receivers |
Jun. 2, 2009 |
| 7539243 |
Method and system for low-power integrating decision feedback equalizer with fast switched-capacitor feed forward path |
May. 26, 2009 |
| 7535289 |
Integrated RC filter |
May. 19, 2009 |
| 7532045 |
Low-complexity active transconductance circuit |
May. 12, 2009 |
| 7525372 |
Noise shaped n th order filter |
Apr. 28, 2009 |
| 7521990 |
Noise reduction circuits |
Apr. 21, 2009 |
| 7521991 |
Balanced band-pass filter for radio receivers |
Apr. 21, 2009 |
| 7518428 |
Phase compensation circuit and power circuit having same |
Apr. 14, 2009 |
| 7518429 |
Delay circuit |
Apr. 14, 2009 |
| 7514990 |
Very low frequency high pass filter |
Apr. 7, 2009 |
| 7511570 |
Transconductance filtering circuit |
Mar. 31, 2009 |
| 7504879 |
Transconductor and filter circuit |
Mar. 17, 2009 |
| 7501885 |
Filter circuit |
Mar. 10, 2009 |
| 7501901 |
Circuit comprising a capacitive circuit component |
Mar. 10, 2009 |
| 7492216 |
Filtering apparatus for correcting variation of CR-product |
Feb. 17, 2009 |
| 7486214 |
Tuning methods for loop-filters of continuous-time sigma-delta modulators |
Feb. 3, 2009 |
| 7477098 |
Method and apparatus for tuning an active filter |
Jan. 13, 2009 |
| 7477099 |
Filter adjustment circuit |
Jan. 13, 2009 |
| 7471142 |
Filter calibration with cell re-use |
Dec. 30, 2008 |
| 7471141 |
Filter circuit |
Dec. 30, 2008 |
| 7468629 |
Tuning circuit for transconductors and related method |
Dec. 23, 2008 |
| 7466175 |
Capacitance multiplier circuit |
Dec. 16, 2008 |
| 7463085 |
Tuning circuit |
Dec. 9, 2008 |
| 7459963 |
Filter apparatus including differential slave gm-C filter with frequency characteristics automatically tuned by master circuit |
Dec. 2, 2008 |
| 7459962 |
Transient signal detection algorithm using order statistic filters applied to the power spectral estimate |
Dec. 2, 2008 |
| 7449942 |
Intrinsic RC power distribution for noise filtering of analog supplies |
Nov. 11, 2008 |
| 7436249 |
Circuit and method for filtering a radio frequency signal |
Oct. 14, 2008 |
| 7436250 |
Highly selective filtering device and corresponding filtering method |
Oct. 14, 2008 |
| 7429889 |
Control system for programmable filters |
Sep. 30, 2008 |
| 7425863 |
Tuneable filters using operational amplifiers |
Sep. 16, 2008 |
| 7424053 |
Channel equalization in data receivers |
Sep. 9, 2008 |
| 7423474 |
Selectable pole bias line filter |
Sep. 9, 2008 |
| 7417495 |
Reconfigurable frequency filter |
Aug. 26, 2008 |
| 7414461 |
Linearization technique for current mode filters |
Aug. 19, 2008 |
| 7411444 |
Technique for improving antialiasing and adjacent channel interference filtering using cascaded passive IIR filter stages combined with direct sampling and mixing |
Aug. 12, 2008 |
| 7403063 |
Apparatus and method for tuning center frequency of a filter |
Jul. 22, 2008 |
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