US Patent No: 4,856,032

Number of patents in Portfolio can not be more than 2000

High speed programmable frequency divider and PLL

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Importance

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Abstract

A phase locked loop including a programmable frequency divider with a variable modulus divider (VMD) having two modes of operation, n and n+1, a programmable counter for counting the number of times the VMD divides the input signal and a comparator for comparing the count in the counter to a predetermined number and switching the VMD from the first mode to the second mode when the instant count and predetermined number are equal. The programmable counter provides an output pulse each time the total count equals a selected number. The VMD is a GaAs semiconductor device.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MOTOROLA, INC.SCHAUMBURG, IL7100

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dilley, David L Ft. Collins, CO 4 33
Klekotka, James E Mesa, AZ 14 41

Cited Art

Patent Info (Count) # Cites Year
 
MIDI MUSIC CENTER, INC., A CORP. OF CA (1)
4,241,408 High resolution fractional divider 15 1979
 
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (1)
4,633,194 Digital frequency divider suitable for a frequency synthesizer 24 1981
 
OTRONICS INTERNATIONAL, INC., A CORP. OF MA (1)
4,518,920 Frequency synthesizer and method 5 1982
 
Tokyo Shibaura Denki Kabushiki Kaisha (1)
4,606,059 Variable frequency divider 22 1984

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
APPLE INC. (1)
8,134,389 Programmable frequency divider 0 2010
 
DELPHI TECHNOLOGIES, INC. (1)
4,972,446 Voltage controlled oscillator using dual modulus divider 6 1989
 
ERICSSON GE MOBILE COMMUNICATIONS HOLDING INC. (1)
5,066,927 Dual modulus counter for use in a phase locked loop 9 1990
 
INTEL CORPORATION (1)
5,425,074 Fast programmable/resettable CMOS Johnson counters 36 1993
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
4,947,411 Programmable clock frequency divider 24 1987
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
5,477,181 Programmable multiphase clock divider 27 1994
 
NORTEL NETWORKS LIMITED (1)
4,965,531 Frequency synthesizers having dividing ratio controlled by sigma-delta modulator 100 1989
 
PLESSEY SEMICONDUCTORS LIMITED (1)
4,943,981 Dividing mechanisms for frequency synthesizers 1 1989
 
SEIKO EPSON CORPORATION (1)
5,020,082 Asynchronous counter 12 1989
 
SILICON GRAPHICS, INC. (1)
4,965,863 Gallium arsenide depletion made MESFIT logic cell 8 1987
 
TELASIC COMMUNICATIONS (1)
4,975,931 High speed programmable divider 21 1988
 
TRIMBLE NAVIGATION LIMITED (1)
5,311,149 Integrated phase locked loop local oscillator 61 1993