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Class Information
Number: 327/79
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific signal discriminating (e.g., comparing, selecting, etc.) without subsequent control > By amplitude > Input signal compared to single fixed reference > Reference level crossover detecting > Zero crossover
Description: Subject matter wherein the reference level which is transited is zero volts.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8669787 Zero-crossing detector for industrial control with low heat dissipation Mar. 11, 2014
8519745 Methods and systems for detection of zero crossings in a signal Aug. 27, 2013
8487661 Zero-crossing gain control system and associated methods Jul. 16, 2013
8476937 Input buffer circuit capable of adjusting variation in skew Jul. 2, 2013
8471600 Detection of the zero crossing of the load current in a semiconductor device Jun. 25, 2013
8248109 Methods and systems for detection of zero crossings in a signal Aug. 21, 2012
8115517 Circuit arrangement for identifying network zero crossings Feb. 14, 2012
8035415 Shift register and semiconductor display device Oct. 11, 2011
7940090 Zero-crossing detecting device and image forming device May. 10, 2011
7843217 Shift register and semiconductor display device Nov. 30, 2010
7804334 High signal level compliant input/output circuits Sep. 28, 2010
7786766 Appliance control system with a zero crossing detecting circuit Aug. 31, 2010
7626439 Cross-point adjustment circuit Dec. 1, 2009
7609681 Communication apparatus and coexistence method for enabling coexistence of communication systems Oct. 27, 2009
7535265 High accuracy zero crossing detector and method therefor May. 19, 2009
7508240 Power mains zero-crossing detector Mar. 24, 2009
7504866 Output hold circuits for sample-data circuits Mar. 17, 2009
7486115 Sampled-data circuits using zero crossing detection Feb. 3, 2009
7459942 Sampled-data circuits using zero crossing detection Dec. 2, 2008
7394295 Sense amplifier Jul. 1, 2008
7298182 Comparator using differential amplifier with reduced current consumption Nov. 20, 2007
7271624 Low-power supply voltage level detection circuit and method Sep. 18, 2007
7259597 Low-voltage detection circuit Aug. 21, 2007
6864755 Switched reactance modulated E-class oscillator design Mar. 8, 2005
6819145 High speed differential pre-driver using common mode pre-charge Nov. 16, 2004
6664817 Zero-cross detection circuit Dec. 16, 2003
6605965 Differential window comparator Aug. 12, 2003
6417701 Method and apparatus for identifying a waveform period Jul. 9, 2002
6389548 Pulse run-length measurement for HF data signal by dividing accumulated phase difference between first and second zero-crossings by single-cycle range using multiple cycle range sawtooth wavef May. 14, 2002
6326816 Method and apparatus for minimal phase delay and zero-crossing filtering Dec. 4, 2001
6275394 Input circuit Aug. 14, 2001
6084364 Using different frequency clocks to clock counters of a driver circuit at spin-up and at regulation Jul. 4, 2000
6052005 Low current drain switch interface circuit Apr. 18, 2000
5973515 Differential input stage for wideband reception with high rejection of common mode Oct. 26, 1999
5903172 Output voltage detection circuit for traffic signal controller May. 11, 1999
5892375 Comparator with small signal suppression circuitry Apr. 6, 1999
5862185 Data signal zero crossing detection process Jan. 19, 1999
5834968 Low pass filter Nov. 10, 1998
5805001 Zero phase circuit for sampled data phase locked loop Sep. 8, 1998
5717348 Self adjusting edge detector circuit Feb. 10, 1998
5670858 Single-phase induction motor safety controller Sep. 23, 1997
5623220 Offset reduction in a zero-detect circuit Apr. 22, 1997
5619165 Voltage threshold detection circuit with very low consumption Apr. 8, 1997
5614851 High-accuracy, low-power peak-to-peak voltage detector Mar. 25, 1997
5606273 Zero crossing detector circuit Feb. 25, 1997
5606257 Device for forming a square-wave signal and detecting a reference mark from a sinusoidal signal with a singularity Feb. 25, 1997
5602500 Circuit for the detection of voltage thresholds Feb. 11, 1997
5440254 Accurate low voltage detect circuit Aug. 8, 1995
5430370 Integration circuit to determine ignition timing Jul. 4, 1995
5410193 Apparatus and technique for connecting a source of zero crossing AC voltage to and disconnecting it from an AC load line Apr. 25, 1995

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