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Class Information
Number: 331/25
Name: Oscillators > Automatic frequency stabilization using a phase or frequency sensing means > With reference oscillator or source > Signal or phase comparator
Description: Subject matter wherein a particular or significant signal or phase comparing network is utilized in the A.F.S. loop of the controlled oscillator.

Sub-classes under this class:

Class Number Class Name Patents
331/29 Electromechanical 0
331/27 Plural active element (e.g., triodes) 179
331/26 Plural diode type 9
331/28 Unilateral element (e.g., diode) 3

Patents under this class:

Patent Number Title Of Patent Date Issued
8693600 Phase excursion/carrier wave frequency excursion compensation device and method Apr. 8, 2014
8692621 Methods and apparatus for oscillator frequency calibration Apr. 8, 2014
8687756 CDR with digitally controlled lock to reference Apr. 1, 2014
8659360 Charge-to-digital timer Feb. 25, 2014
8649445 Methods and systems for noise resilient, pin-efficient and low power communications with sparse signaling codes Feb. 11, 2014
8624679 Method and apparatus for MEMS phase locked loop Jan. 7, 2014
8618967 Systems, circuits, and methods for a sigma-delta based time to digital converter Dec. 31, 2013
8618886 Method of establishing an oscillator clock signal Dec. 31, 2013
8564374 Oscillator calibration apparatus and oscillator calibration method Oct. 22, 2013
8532590 Digital phase feedback for determining phase distortion Sep. 10, 2013
8508271 Phase locked loop Aug. 13, 2013
8502609 Reference-less frequency detector Aug. 6, 2013
8493112 Signal processing apparatus Jul. 23, 2013
8487707 Frequency synthesizer Jul. 16, 2013
8462579 Method and apparatus for reducing oscillation in synchronous circuits Jun. 11, 2013
8456242 Frequency locked loop Jun. 4, 2013
8451067 Variable modulus modulator for fractional-N frequency synthesizers May. 28, 2013
8451066 PLL circuit and angular velocity sensor using the same May. 28, 2013
8441323 Signal processing using timing comparison May. 14, 2013
8437701 Method and terminal for acquiring frequency difference May. 7, 2013
8432230 High accuracy oscillator and an auto-trimming method thereof Apr. 30, 2013
8373461 PLL frequency synthesizer Feb. 12, 2013
8368480 Phase locked loop circuits and gain calibration methods thereof Feb. 5, 2013
8362932 Circuit with a time to digital converter and phase measuring method Jan. 29, 2013
8362817 Phase comparator and clock data recovery circuit Jan. 29, 2013
8355239 Predictive phase locked loop system Jan. 15, 2013
8351867 Oscillator, frequency generating circuit and wireless communication system using the oscillator Jan. 8, 2013
8339296 Amplifying circuit and analog-digital converting circuit including same Dec. 25, 2012
8339206 PLL Dec. 25, 2012
8339093 System and method of dynamic regulation of real power to a load Dec. 25, 2012
8289087 Method for detecting and correcting phase shift between I data clock in Q data clock in quadrature modulator or quadrature demodulator Oct. 16, 2012
8289086 Fractional and integer PLL architectures Oct. 16, 2012
8283983 Frequency calibration device and method for programmable oscillator Oct. 9, 2012
8275087 Frequency synchronization using first and second frequency error estimators Sep. 25, 2012
8259888 Method of processing signal data with corrected clock phase offset Sep. 4, 2012
8253500 Frequency-phase adjusting device and method thereof Aug. 28, 2012
8253499 Charge pump and phase detection apparatus, phase-locked loop and delay-locked loop using the same Aug. 28, 2012
8249533 Rapidly adjustable local oscillation module and applications thereof Aug. 21, 2012
8242857 Single side band mixer and local oscillator having the same Aug. 14, 2012
8242848 Oscillation frequency control circuit, and DC-DC converter and semiconductor device having the same Aug. 14, 2012
8207795 Delay cell of ring oscillator and associated method Jun. 26, 2012
8207794 Phase locked loop and 3-stage frequency divider Jun. 26, 2012
8193963 Method and system for time to digital conversion with calibration and correction loops Jun. 5, 2012
8188795 Phase comparator and reproduction signal processor using the same May. 29, 2012
8184762 Digital phase lock loop with multi-phase master clock May. 22, 2012
8183938 Tuning methods and apparatus for inductively coupled power transfer (ICPT) systems May. 22, 2012
8179163 Method and apparatus for charge pump linearization in fractional-N PLLs May. 15, 2012
8174324 Digital phase detector, and digital phase locked loop including the same May. 8, 2012
8164390 Regulating an operating condition of an integrated circuit to compensate for a manufacturing variation Apr. 24, 2012
8154782 Method and system for generating a drive signal for a MEMS scanner Apr. 10, 2012

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