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Class Information
Number: 331/18
Name: Oscillators > Automatic frequency stabilization using a phase or frequency sensing means > With reference oscillator or source
Description: Subject matter wherein the A.F.S. circuit of the controlled oscillator includes a source of constant frequency, which source serves as a frequency standard, means being provided for comparing the frequency of the oscillations generated by the controlled oscillator with the standard frequency, the frequency comparison means producing an electrical control or error signal which is a measure of the deviation, in direction and amount, of the controlled oscillator frequency from the standard frequency, the control or error signal being applied to the frequency adjustment means of the controlled oscillator in such a manner as to reduce the frequency difference between the generated oscillations of the controlled oscillator and the oscillations of the constant frequency source to a minimum.

Sub-classes under this class:

Class Number Class Name Patents
331/22 Plural significant heterodyne stages 46
331/23 Sensing modulation (e.g., frequency modulation controlled oscillator 255
331/25 Signal or phase comparator 2,047
331/19 Spectrum reference source 53
331/20 T.v. sync type 151

Patents under this class:
1 2 3 4 5 6 7 8 9 10 11

Patent Number Title Of Patent Date Issued
8712360 System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS Apr. 29, 2014
8710938 Electronic device including predicted frequency error estimation of a voltage controlled oscillator and related methods Apr. 29, 2014
8704604 Oscillators having arbitrary frequencies and related systems and methods Apr. 22, 2014
8630593 Semiconductor device, wireless communication device and method for generating a synthesized frequency signal Jan. 14, 2014
8624645 Multi phase clock signal generator, signal phase adjusting loop utilizing the multi phase clock signal generator, and multi phase clock signal generating method Jan. 7, 2014
8624679 Method and apparatus for MEMS phase locked loop Jan. 7, 2014
8610508 Injection-locked oscillator Dec. 17, 2013
8604888 Oscillators having arbitrary frequencies and related systems and methods Dec. 10, 2013
8598956 System and method for reducing holdover duration Dec. 3, 2013
8576014 System and method for selecting optimum local oscillator discipline source Nov. 5, 2013
8552807 Electronic apparatus compensated through monitoring a status of GNSS receiver and related method thereof Oct. 8, 2013
8532600 System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS Sep. 10, 2013
8487707 Frequency synthesizer Jul. 16, 2013
8476982 Reference oscillator management for wireless devices having position determination functionality Jul. 2, 2013
8467758 Frequency tuning circuit, phase-locked loop circuit, communication apparatus, and storage apparatus Jun. 18, 2013
8466751 High-precision and low-consumption quartz oscillator Jun. 18, 2013
8463205 Transmitting apparatus operative at a plurality of different bands and associated method Jun. 11, 2013
8395419 Semiconductor device and display device Mar. 12, 2013
8373461 PLL frequency synthesizer Feb. 12, 2013
8368478 Integrated circuit frequency generator Feb. 5, 2013
8362845 Method and apparatus to improve performance of GPSDO's and other oscillators Jan. 29, 2013
8301098 System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS Oct. 30, 2012
8264283 Single side band mixer Sep. 11, 2012
8242848 Oscillation frequency control circuit, and DC-DC converter and semiconductor device having the same Aug. 14, 2012
8183937 Integrated circuit frequency generator May. 22, 2012
8174329 Power management architecture and method of modulating oscillator frequency based on voltage supply May. 8, 2012
8138841 Apparatus and method for controlling the output phase of a VCO Mar. 20, 2012
8130892 ADPLL frequency synthesizer Mar. 6, 2012
8125254 Techniques for configuring multi-path feedback loops Feb. 28, 2012
8125279 System and method for reducing holdover duration Feb. 28, 2012
8125253 System and method for dynamically switching between low and high frequency reference clock to PLL and minimizing PLL output frequency changes Feb. 28, 2012
8120433 Multi-output oscillator using single oscillator Feb. 21, 2012
8120432 System and method for selecting optimum local oscillator discipline source Feb. 21, 2012
8116358 Single oscillator transceiver Feb. 14, 2012
8116359 Single oscillator transceiver Feb. 14, 2012
8102158 Phase synchronization circuit Jan. 24, 2012
8095818 Method and apparatus for on-demand power management Jan. 10, 2012
8095615 System for synchronizing signals including a slave signal generator generating elapsed time data with respect to an initial time point and related methods Jan. 10, 2012
8089318 Methods, algorithms, circuits, and systems for determining a reference clock frequency and/or locking a loop oscillator Jan. 3, 2012
8076978 Circuit with noise shaper Dec. 13, 2011
8073416 Method and apparatus for controlling a bias current of a VCO in a phase-locked loop Dec. 6, 2011
8058942 Dual reference oscillator phase-lock loop Nov. 15, 2011
8058917 Compensation of phase lock loop (PLL) phase distribution caused by power amplifier ramping Nov. 15, 2011
8044722 Oscillation frequency control circuit Oct. 25, 2011
8040193 Oscillation adjusting circuit and method Oct. 18, 2011
8040194 Frequency synthesizer using a phase-locked loop and single side band mixer Oct. 18, 2011
8030904 Oscillator circuit Oct. 4, 2011
8027423 Synchronizing apparatus, synchronizing method, synchronizing program and data reproduction apparatus Sep. 27, 2011
8022773 Clock signal generation device, and wireless base station Sep. 20, 2011
8010072 Charge pump current compensation for phase-locked loop frequency synthesizer systems Aug. 30, 2011

1 2 3 4 5 6 7 8 9 10 11

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