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Class Information
Number: 327/5
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific signal discriminating (e.g., comparing, selecting, etc.) without subsequent control > By phase > Comparison between plural inputs (e.g., phase angle indication, lead-lag discriminator, etc.) > With input derived from feedback
Description: Subject matter wherein a portion of the output signal is returned to one of the plural inputs.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8669786 Clock phase shift detector Mar. 11, 2014
8604840 Frequency synthesizer noise reduction Dec. 10, 2013
8354867 Phase-locked loop circuit and an associated method Jan. 15, 2013
8217683 Phase-detector for detecting phase difference of [PI]2N Jul. 10, 2012
8179163 Method and apparatus for charge pump linearization in fractional-N PLLs May. 15, 2012
8179162 Phase-lock assistant circuitry May. 15, 2012
8111106 Switched phase and frequency detector based DPLL circuit with excellent wander and jitter performance and fast frequency acquisition Feb. 7, 2012
8013636 Synchronous phase detection circuit Sep. 6, 2011
7940088 High speed phase frequency detector May. 10, 2011
7855580 Phase comparator, phase synchronizing circuit, and phase-comparison control method Dec. 21, 2010
7847641 Digital phase and frequency detector Dec. 7, 2010
7839222 Systems and methods using programmable fixed frequency digitally controlled oscillators for multirate low jitter frequency synthesis Nov. 23, 2010
7839177 Techniques for phase detection with fast reset Nov. 23, 2010
7812644 Digital frequency detector and digital phase locked loop using the digital frequency detector Oct. 12, 2010
7764759 Linear sample and hold phase detector for clocking circuits Jul. 27, 2010
7755397 Methods and apparatus for digital phase detection with improved frequency locking Jul. 13, 2010
7724095 Floating DC-offset circuit for phase detector May. 25, 2010
7683675 Radiation hardened phase frequency detector for implementing enhanced radiation immunity performance Mar. 23, 2010
7675335 Phase detecting module and related phase detecting method Mar. 9, 2010
7675328 Phase detection apparatus and phase synchronization apparatus Mar. 9, 2010
7629816 Method and apparatus for pre-clocking Dec. 8, 2009
7498889 Analog phase controller Mar. 3, 2009
7489203 Noise tolerant phase locked loop Feb. 10, 2009
7482842 Radiation hardened phase frequency detector for implementing enhanced radiation immunity performance Jan. 27, 2009
7449962 Phase-controlled current source for phase-locked loop Nov. 11, 2008
7447290 Apparatus of phase-frequency detector Nov. 4, 2008
7443251 Digital phase and frequency detector Oct. 28, 2008
7375558 Method and apparatus for pre-clocking May. 20, 2008
7375557 Phase-locked loop and method thereof and a phase-frequency detector and method thereof May. 20, 2008
7336106 Phase detector and method having hysteresis characteristics Feb. 26, 2008
7319350 Lock-detection circuit and PLL circuit using same Jan. 15, 2008
7304510 Digital phase detector improving phase detection resolution thereof Dec. 4, 2007
7161391 Skew tolerant high-speed digital phase detector Jan. 9, 2007
7145367 Fractional-integer phase-locked loop system with a fractional-frequency-interval phase frequency detector Dec. 5, 2006
7119583 Phase detector and method having hysteresis characteristics Oct. 10, 2006
7084670 Phase-frequency detector with gated reference clock input Aug. 1, 2006
7049852 Fractional-integer phase-locked loop system with a fractional-frequency-interval phase frequency detector May. 23, 2006
7009461 Phase shifted binary transmission encoder, a phase modulator, and an optical network element for encoding phase shifted binary transmission Mar. 7, 2006
6967503 Comparator Nov. 22, 2005
6867654 Additive phase detector and its use in high speed phase-locked loops Mar. 15, 2005
6636090 Phase-locked loop circuit outputting clock signal having fixed phase difference with respect to input clock signal Oct. 21, 2003
6625765 Memory based phase locked loop Sep. 23, 2003
6556643 Majority filter counter circuit Apr. 29, 2003
6549041 Scheme for delay locked loop reset protection Apr. 15, 2003
6448820 Fast locking phase frequency detector Sep. 10, 2002
6275072 Combined phase comparator and charge pump circuit Aug. 14, 2001
6181175 Clock generator and synchronizing method Jan. 30, 2001
6157218 Phase-frequency detection with no dead zone Dec. 5, 2000
6140852 Digital phase-locked loop with pulse controlled charge pump Oct. 31, 2000
6100721 Circuit and method of extending the linear range of a phase frequency detector Aug. 8, 2000

1 2 3

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