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Class Information
Number: 455/257
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Local control of receiver operation > Local oscillator frequency control > Automatic
Description: Subject matter wherein the control means consists of a self-acting control circuit or loop whereby the output frequency of the oscillator means or the output of the mixer means is maintained constant at a desired frequency or within a desired frequency range. The control circuit or loop generally includes discriminator means for sensing the deviation of the oscillator output frequency in direction and amount with means for producing a control energy corresponding to the sensed deviation and applying the generated control energy to a controlling means in the oscillator circuit in the proper sense or direction to restore the oscillator output frequency to a desired value.










Sub-classes under this class:

Class Number Class Name Patents
455/258 Utilizing particular local oscillator control 214
455/265 With local oscillator synchronization or locking 281


Patents under this class:
1 2

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
8687748 Radio frequency control for communication systems Apr. 1, 2014
8682273 RF digital spur reduction Mar. 25, 2014
8670737 Digital delta Sigma modulator and applications thereof Mar. 11, 2014
8588720 Signal decimation techniques Nov. 19, 2013
8559904 System and method for duty cycle control of a crystal oscillator Oct. 15, 2013
8532600 System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS Sep. 10, 2013
8483332 Oscillating apparatus, receiving apparatus, and oscillation control method Jul. 9, 2013
8433270 Method for tuning an oscillator frequency and device implementing the method Apr. 30, 2013
8355688 Method and system for frequency selection using microstrip transceivers for high-speed applications Jan. 15, 2013
8355752 Using LO shifting to prevent a local transceiver from interfering with an FM radio Jan. 15, 2013
8346194 Radio broadcast receiver Jan. 1, 2013
8301098 System and transceiver clocking to minimize required number of reference sources in multi-function cellular applications including GPS Oct. 30, 2012
8180407 Automatic reduction of background wireless communication in a media player mode May. 15, 2012
8140038 Adaptive receivers Mar. 20, 2012
8090333 Receiving apparatus, receiving method, and program Jan. 3, 2012
8073416 Method and apparatus for controlling a bias current of a VCO in a phase-locked loop Dec. 6, 2011
8064862 Antenna diversity method with fallback and weighting Nov. 22, 2011
7865158 Method and apparatus for automatically correcting receiver oscillator frequency Jan. 4, 2011
7831197 Outside unit for satellite reception and method of reception with said unit Nov. 9, 2010
7809344 Fractional carrier frequency offset estimator and method of estimating fractional carrier frequency offset between transmitter and receiver Oct. 5, 2010
7796710 Digital signal demodulator and wireless receiver using the same Sep. 14, 2010
7778619 Method and apparatus for automatic frequency correction with a frequency error signal generated by block correlation of baseband samples with a known code sequence Aug. 17, 2010
7630698 Fast switching, dual frequency phase locked loop Dec. 8, 2009
7596365 Device for transmitting and receiving Sep. 29, 2009
7570926 RF transceiver with compact stacker mixer design for multiple frequency conversion Aug. 4, 2009
7565112 Reduced adjacent channel interference in a radio receiver Jul. 21, 2009
7541884 Methods and apparatus for crystal oscillator drift estimation and compensation Jun. 2, 2009
7509108 Method and apparatus for automatic frequency correction with a frequency error signal generated by block correlation of baseband samples with a known code sequence Mar. 24, 2009
7447483 Radio apparatus and a method for reducing interference in a radio apparatus Nov. 4, 2008
7313379 Generation of a self-correcting local oscillation Dec. 25, 2007
7295824 Frequency multiplier pre-stage for fractional-N phase-locked loops Nov. 13, 2007
7233774 RF transceiver with compact stacked mixer design for multiple frequency conversion Jun. 19, 2007
7206560 Chopped intermediate frequency wireless receiver Apr. 17, 2007
7133647 Chiprate correction in digital transceivers Nov. 7, 2006
7133653 Receiver and composite component having local oscillator components and mixing circuit integrally formed on semiconductor substrate Nov. 7, 2006
7103339 Automatic frequency correction method and receiver for time division duplex modes of 3G wireless communications Sep. 5, 2006
7095989 Frequency translating devices and frequency translating measurement systems with DC bias added to a mixer diode Aug. 22, 2006
7082295 On-chip loop filter for use in a phase locked loop and other applications Jul. 25, 2006
7079826 Digitally controlled analog RF filtering in subsampling communication receiver architecture Jul. 18, 2006
7035605 Method and device for automatic control of the frequency of a local oscillator in a DS-CDMA type receiver Apr. 25, 2006
7002233 Integrated circuit including an inductive element having a large quality factor and being highly compact Feb. 21, 2006
6980774 Radio frequency integrated circuit Dec. 27, 2005
6975839 Apparatus, and associated method, for estimating frequency offset using filtered, down-sampled likelihood polynomials Dec. 13, 2005
6968165 Frequency scanning receiver permitting quick PPL setting Nov. 22, 2005
6850745 Method and apparatus for generating a self-correcting local oscillation Feb. 1, 2005
6829469 Method and a device for producing a signal Dec. 7, 2004
6813482 Radio communication apparatus and method Nov. 2, 2004
6748036 Radio receiving method and apparatus Jun. 8, 2004
6658241 Radio receiver automatic frequency control techniques Dec. 2, 2003

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