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Browse by Category: Main > Electrical & Energy
Class Information
Number: 324/76.48
Name: Electricity: measuring and testing > Measuring, testing, or sensing electricity, per se > Frequency of cyclic current or voltage (e.g., cyclic counting etc.) > Frequency comparison, (e.g., heterodyne, etc.) > Digital output > With counter
Description: Subject matter including a device capable of changing stages in a specified sequence upon receiving appropriate signals.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8664933 Frequency measuring apparatus Mar. 4, 2014
8648622 Method and device for monitoring a frequency signal Feb. 11, 2014
8575914 Frequency measuring apparatus Nov. 5, 2013
8508213 Frequency measurement device Aug. 13, 2013
8461821 Frequency measuring apparatus Jun. 11, 2013
8278960 Method and circuit for measuring quiescent current Oct. 2, 2012
8248169 Semiconductor integrated circuit and abnormal oscillation detection method for semiconductor integrated circuit Aug. 21, 2012
8237447 Apparatus for detecting state of storage device Aug. 7, 2012
8169236 Frequency detection mechanism for a clock generation circuit May. 1, 2012
8125250 Frequency detection mechanism for a clock generation circuit Feb. 28, 2012
7944217 Object proximity detector and object position detector May. 17, 2011
7750618 System and method for testing a clock circuit Jul. 6, 2010
7710750 Inverter with time counting function May. 4, 2010
7692419 Method and apparatus for enhanced frequency measurement Apr. 6, 2010
7505738 Broadband receiver Mar. 17, 2009
7495428 Pulse generator, timing generator, and pulse width adjusting method Feb. 24, 2009
7468601 Direct phase and frequency demodulation Dec. 23, 2008
7453255 Circuit and method for measuring delay of high speed signals Nov. 18, 2008
7400130 Integrated circuit device Jul. 15, 2008
7355537 Built-in self-test apparatus and method for digital-to-analog converter Apr. 8, 2008
7298130 Signal detector Nov. 20, 2007
7118269 Method of correcting a real-time clock of an electronic apparatus Oct. 10, 2006
7113886 Circuit and method for distributing events in an event stream Sep. 26, 2006
6979995 Frequency measuring circuit and resonant pressure sensor type differential pressure/pressure transmitter using the frequency measuring unit Dec. 27, 2005
6969984 Direct phase and frequency demodulation Nov. 29, 2005
6917191 Frequency measurement circuit Jul. 12, 2005
6853177 Semiconductor device with process monitor circuit and test method thereof Feb. 8, 2005
6806698 Quantifying a difference between nodal voltages Oct. 19, 2004
6788044 Frequency change measuring device Sep. 7, 2004
6774615 Resonance-frequency measuring method determining a resonance frequency by counting the number of off-track occurrences Aug. 10, 2004
6771063 Methods and systems for improving the duty cycle output of a vehicle speed sensor circuit Aug. 3, 2004
6674277 Frequency measurement circuit Jan. 6, 2004
6665367 Embedded frequency counter with flexible configuration Dec. 16, 2003
6608474 Frequency change measuring device Aug. 19, 2003
6557117 Built-in self test for PLL module with on-chip loop filter Apr. 29, 2003
6548997 Mechanism for measurement of time duration between asynchronous events Apr. 15, 2003
6292524 Counting apparatus and rotation stopped detection apparatus which uses a counting apparatus Sep. 18, 2001
6246223 Method for use on a parametric tester to measure the output frequency of a ring oscillator through voltage sampling Jun. 12, 2001
6005382 Output signal measuring apparatus for multiple frequency oscillator and output signal measuring and correcting methods thereof Dec. 21, 1999
6005381 Electrical signal phase detector Dec. 21, 1999
5832414 Generator protection system and method of compensating for errors in phasor estimation due to oscillations in discrete Fourier transform Nov. 3, 1998
5764045 Frequency measuring apparatus Jun. 9, 1998
5710710 Frequency counter with reduced false correlations Jan. 20, 1998
5686835 Physical quantity detection device for converting a physical quantity into a corresponding time interval Nov. 11, 1997
5663970 Circuit and method for testing frequencies Sep. 2, 1997
5500627 Precision duty cycle phase lock loop Mar. 19, 1996
5471402 Frequency counter Nov. 28, 1995
5442278 Apparatus for detecting the frequency of an input signal by counting pulses during an input signal cycle Aug. 15, 1995
5438254 Phase difference measuring device Aug. 1, 1995
5391982 Apparatus for automatically recognizing a frequency of a power supply and method thereof Feb. 21, 1995

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