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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:

Class Number Class Name Patents
327/553 Adjustable 469
327/557 Bandpass 189
327/559 Highpass 101
327/558 Lowpass 335
327/556 Notch or bandreject 81


Patents under this class:

Patent Number Title Of Patent Date Issued
8710920 Charge domain filter and method thereof Apr. 29, 2014
8710919 Data processing method Apr. 29, 2014
8688067 Sampling circuit and receiver using same Apr. 1, 2014
8686788 Filter circuit Apr. 1, 2014
8674753 Systems and methods for cancelling phase-locked loop supply noise Mar. 18, 2014
8665011 Micro electro-mechanical system circuit capable of compensating capacitance variation and method thereof Mar. 4, 2014
8664987 Filtering circuit, phase identity determination circuit and delay locked loop Mar. 4, 2014
8648653 Method and apparatus for reducing interference Feb. 11, 2014
8648652 Band pass filter and calibration method for band pass filter Feb. 11, 2014
8638156 Multi-output-resistance switch driver circuits Jan. 28, 2014
8633760 Op-R, a solid state filter Jan. 21, 2014
8626103 Method and apparatus for filtering Jan. 7, 2014
8624666 Interleaved noise reduction circuit and method Jan. 7, 2014
8620978 System and method for filtering electrophysiological signals Dec. 31, 2013
8620251 Electronic device with adjustable filter and associated methods Dec. 31, 2013
8618872 Filter with controlled cut-off frequency step-down Dec. 31, 2013
8618871 Noise reduction device and semiconductor device having the same Dec. 31, 2013
8605840 Method to cancel impulsive interference from a signal processing system Dec. 10, 2013
8605465 Methods of controlling a synchronous rectifier Dec. 10, 2013
8604839 Filter comprising a current-to-voltage converter Dec. 10, 2013
8598911 Pulse width filter Dec. 3, 2013
8594605 Semiconductor integrated circuit and operation method of the same Nov. 26, 2013
8593216 Loop filter with noise cancellation Nov. 26, 2013
8587371 Electric circuit for reducing energy consumption Nov. 19, 2013
8570117 Bias circuit Oct. 29, 2013
8570099 Single-ended-to-differential filter using common mode feedback Oct. 29, 2013
8564363 Pulse filter and bridge driver using the same Oct. 22, 2013
8564362 Filter circuit, semiconductor integrated circuit, communication apparatus, semiconductor device, and system Oct. 22, 2013
8552797 High accuracy RC calibradion circuit Oct. 8, 2013
8547261 Calibration device for mobile terminal and ADC module thereof Oct. 1, 2013
8547169 Programmable noise filtering for bias kickback disturbances Oct. 1, 2013
8525584 Automatic cutoff frequency adjusting circuit and portable digital assistant Sep. 3, 2013
8514012 Pulse shaper circuit with reduced electromagnetic emission Aug. 20, 2013
8508292 Phase matching band-pass filter using exponential function approximation Aug. 13, 2013
8508290 Interface for MEMS inertial sensors Aug. 13, 2013
8502597 Low-pass filter design Aug. 6, 2013
8498606 Data rate tracking filter Jul. 30, 2013
8487694 Charge domain filter apparatus Jul. 16, 2013
8487693 Self calibrated, broadband, tunable, active oscillator with unity gain cells for multi-standard and/or multiband channel selection Jul. 16, 2013
8482339 Method and apparatus for temperature compensation of filter circuits Jul. 9, 2013
8476970 Interface for MEMS inertial sensors Jul. 2, 2013
8476969 Transistor-based filter for inhibiting load noise from entering a power supply Jul. 2, 2013
8461917 Complimentary single-ended-input OTA-C universal filter structures Jun. 11, 2013
8441313 Current-mode analog baseband apparatus May. 14, 2013
8427230 Current-mode analog baseband apparatus Apr. 23, 2013
8421530 Filter circuit, integrated circuit including the same, and signal filtering method Apr. 16, 2013
8421529 Method and apparatus for reducing interference Apr. 16, 2013
8416014 Switched capacitor notch filter with fast response time Apr. 9, 2013
8410844 Filter device and control method of the same Apr. 2, 2013
8406723 Radio frequency filter having an active inductor Mar. 26, 2013











 
 
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