Frequency synthesizer

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5258724
SERIAL NO

06566947

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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The fractional division frequency synthesizer comprises a digital ramp generator producing a digital correction ramp controlled by a frequency control programmer; a divide by N divider coupled to an output of a voltage controlled oscillator with the divider being controlled by the program, where N is a selected one of an integer and a fraction one or greater; a digital phase detector coupled to a reference clock and the output of the divider to provide a digital phase error signal; a digital adder coupled to an output of the ramp generator and the phase detector to produce a ramp corrected digital phase error signal; and circuit arrangement coupled to an output of the adder and a control input of the controlled oscillator to convert the ramp corrected digital phase error signal to a ramp corrected analog phase error signal to control the controlled oscillator and thereby provide a controlled frequency signal at the output thereof.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ITT CORPORATIONNEW YORK, NY146

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lu, Ning H Parsippany, NJ 7 159
Schenberg, Alan N Kinnelon, NJ 4 110
Tanis, William J Wayne, NJ 3 77

Cited Art Landscape

Patent Info (Count) # Cites Year
 
TDK CORPORATION (1)
* 2004/0100,736 Head support mechanism and thin film piezoelectric actuator 1 2003
 
MOTOROLA, INC. (1)
* 4472820 Program swallow counting device using a single synchronous counter for frequency synthesizing 12 1981
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
STMICROELECTRONICS INTERNATIONAL N.V. (1)
6574288 Method and apparatus for adjusting a digital control word to tune synthesized high-frequency signals for wireless communications 22 1998
 
APPLE INC. (1)
* 5781044 Delta-sigma fractional-N frequency synthesizer and frequency discriminator suitable for use therein 41 1996
 
LANTIQ DEUTSCHLAND GMBH (1)
6970046 Digital phase-locked loop 15 2001
 
RENESAS ELECTRONICS CORPORATION (8)
* 6791385 Clock controlling method and circuit 1 2001
* 6621317 Clock controlling method and circuit 20 2002
* 6888387 Clock controlling method and circuit 3 2003
* 6791386 Clock controlling method and circuit with a multi-phase multiplication clock generating circuit 1 2003
7034592 Clock controlling method and circuit 3 2004
* 6965259 Clock controlling method and circuit 2 2004
6900680 Clock controlling method and circuit 0 2004
* 6847243 Clock controlling method and circuit 0 2004
 
GLOBALFOUNDRIES INC. (1)
8476945 Phase profile generator 1 2011
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
* 5461344 Phase lock loop frequency synthesizer 21 1993
 
RICOH COMPANY, LTD. (1)
* 5805871 System and method for phase-synchronous, flexible-frequency clocking and messaging 28 1995
 
SILICON LABORATORIES INC. (21)
* 6167245 Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications 75 1998
* 6150891 PLL synthesizer having phase shifted control signals 61 1998
6323735 Method and apparatus for synthesizing high-frequency signals utilizing on-package oscillator circuit inductors 82 2000
6388536 Method and apparatus for providing coarse and fine tuning control for synthesizing high-frequency signals for wireless communications 22 2000
6317006 Frequency synthesizer utilizing phase shifted control signals 18 2000
* 6741846 Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications 45 2000
6549764 Method and apparatus for selecting capacitance amounts to vary the output frequency of a controlled oscillator 12 2001
6549765 Phase locked loop circuitry for synthesizing high-frequency signals and associated method 19 2001
6483390 Method and apparatus for synthesizing dual band high-frequency signals for wireless communications 12 2001
6760575 Method and apparatus for generating a variable capacitance for synthesizing high-frequency signals for wireless communications 20 2001
7092675 Apparatus and methods for generating radio frequencies in communication circuitry using multiple control signals 74 2002
6993314 Apparatus for generating multiple radio frequencies in communication circuitry and associated methods 19 2002
6965761 Controlled oscillator circuitry for synthesizing high-frequency signals and associated method 4 2003
* 2003/0119,467 Method and apparatus for operating a PLL for synthesizing high-frequency signals for wireless communications 2 2003
7242912 Partitioning of radio-frequency apparatus 15 2003
7035607 Systems and methods for providing an adjustable reference signal to RF circuitry 67 2003
6993307 Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications 5 2003
* 2004/0075,506 Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications 4 2003
7221921 Partitioning of radio-frequency apparatus 20 2003
7353011 Method and apparatus for operating a PLL for synthesizing high-frequency signals for wireless communications 4 2005
7200364 Frequency modification circuitry for use in radio-frequency communication apparatus and associated methods 11 2005
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
7348730 Metal halide lamp and luminaire 0 2004
 
NORTHROP GRUMMAN SYSTEMS CORPORATION (1)
* 7570201 Radar exciter including phase compensation of the waveform generator 2 2004
 
MOTOROLA SOLUTIONS, INC. (1)
* 5831482 Method and apparatus for self-tuning a voltage controlled oscillator (VCO) 24 1997
* Cited By Examiner