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Class Information
Number: 331/23
Name: Oscillators > Automatic frequency stabilization using a phase or frequency sensing means > With reference oscillator or source > Sensing modulation (e.g., frequency modulation controlled oscillator
Description: Subject matter wherein means are provided to frequency modulate the generated oscillations of the controlled oscillator by a low frequency reference source, signals representative of the modulated signal being compared with signals from the low frequency reference source in a signal comparator, the error signal from the output of the comparator being utilized to restore the generated frequency of the oscillator to the desired relationship with the reference frequency.

Sub-classes under this class:

Class Number Class Name Patents
331/24 With motor comparator 1

Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8531244 High frequency signal processing device Sep. 10, 2013
8368480 Phase locked loop circuits and gain calibration methods thereof Feb. 5, 2013
8306067 Dual-frequency multiplexer Nov. 6, 2012
8248167 VCO frequency temperature compensation system for PLLs Aug. 21, 2012
8174326 Phase lock loop control error selection system and method May. 8, 2012
8107582 Methods and apparatus for digital clock recovery Jan. 31, 2012
8085097 Integrated ramp, sweep fractional frequency synthesizer on an integrated circuit chip Dec. 27, 2011
8063669 Frequency synthesizer having a plurality of independent output tones Nov. 22, 2011
8054137 Method and apparatus for integrating a FLL loop filter in polar transmitters Nov. 8, 2011
8044725 Signal generator with directly-extractable DDS signal source Oct. 25, 2011
8022782 Two-point phase modulator and method of calibrating conversion gain of the same Sep. 20, 2011
7948274 Frequency generation circuitry and method May. 24, 2011
7893773 Phase locked loop modulator calibration techniques Feb. 22, 2011
7777576 Digital phase locked loop with gear shifting Aug. 17, 2010
7755439 Phase locked loop circuit performing two point modulation and gain calibration method thereof Jul. 13, 2010
7741928 Frequency modulation using a digital frequency locked loop Jun. 22, 2010
7737800 Frequency modulation circuit Jun. 15, 2010
7728690 Method and apparatus for compensating for tuning nonlinearity of an oscillator Jun. 1, 2010
7701297 Spread spectrum frequency synthesizer with improved frequency shape by adjusting the length of a standard curve used for spread spectrum modulation Apr. 20, 2010
7692498 Phase locked loop, transceiver device and method for generating an oscillator signal Apr. 6, 2010
7683723 Phase locked loop circuits, offset PLL transmitters, radio frequency integrated circuits and mobile phone systems Mar. 23, 2010
7679468 K.sub.FM frequency tracking system using a digital correlator Mar. 16, 2010
7589586 High frequency signal detection circuit Sep. 15, 2009
7579919 Method and apparatus for compensating temperature changes in an oscillator-based frequency synthesizer Aug. 25, 2009
7573348 Arrangement and method for determining a gradient factor for a digitally controlled oscillator, and phase locked loop Aug. 11, 2009
7567629 Multiphase clock recovery Jul. 28, 2009
7538623 Phase locked loop modulator calibration techniques May. 26, 2009
7538706 Mash modulator and frequency synthesizer using the same May. 26, 2009
7522011 High pass modulation of a phase locked loop Apr. 21, 2009
7499688 Communication semiconductor integrated circuit device and a wireless communication system Mar. 3, 2009
7499689 Communication semiconductor integrated circuit device and a wireless communication system Mar. 3, 2009
7482883 Gain normalization of a digitally controlled oscillator in an all digital phase locked loop based transmitter Jan. 27, 2009
7443261 Phase modulating apparatus, communication device, mobile wireless unit, and phase modulating method Oct. 28, 2008
7436263 Apparatus and method for presenting a modulated output signal at an output locus Oct. 14, 2008
7420433 Phase lock loop RF modulator system Sep. 2, 2008
7417514 Method for modulating phase or frequency in a communication system using clock division Aug. 26, 2008
7411469 Circuit arrangement Aug. 12, 2008
7408418 Phase locked loop circuit having reduced lock time Aug. 5, 2008
7391270 Phase locked loop and method for phase correction of a frequency controllable oscillator Jun. 24, 2008
7382201 Signal generating apparatus and method thereof Jun. 3, 2008
7378918 Two-point modulation type phase modulation apparatus, polar modulation transmission apparatus, wireless transmission apparatus and wireless communication apparatus May. 27, 2008
7372337 Voltage controlled oscillator comprising an injection pulling compensation circuit May. 13, 2008
7358825 Variable capacitance circuit arrangement Apr. 15, 2008
7352250 Phase locked loop circuits, offset PLL transmitters, radio frequency integrated circuits and mobile phone systems Apr. 1, 2008
7292107 Modulation method and apparatus with adjustable divisors of the dividers in phase-locked loop Nov. 6, 2007
7292118 Modulator Nov. 6, 2007
7288999 Pre-distortion system for a synthesizer having modulation applied in the reference path Oct. 30, 2007
7209016 Variable capacitance circuit arrangement Apr. 24, 2007
7205850 Communication semiconductor integrated circuit device and a wireless communication system Apr. 17, 2007
7187247 Variable capacitance circuit arrangement Mar. 6, 2007

1 2 3 4 5 6

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