US Patent No: 4,975,931

Number of patents in Portfolio can not be more than 2000

High speed programmable divider

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Abstract

A programmable counter or frequency divider includes the combination of a fixed modulus prescaler (110) and a programmable divider (120, 130, 140, 150, 160) in which the prescaler provides more than a single clock phase to the programmable divider and the programmable divider utilizes the multiple clock phases to allow operation in a true fractional-integer mode. The overall combination of the prescaler and programmable divider functions as a programmable divider for which the minimum increment in the overall divider modulus is less than the prescaler modulus, but the maximum clock frequency usable is the maximum clock frequency of the prescaler.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MICROELECTRONICS TECHNOLOGY, INC.HSINCHU104
TELASIC COMMUNICATIONSLOS ANGELES, CA36

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cosand, Albert E Agoura Hills, CA 19 277

Cited Art

Patent Info (Count) # Cites Year
 
MOTOROLA, INC. (2)
4,193,037 Frequency divider circuit with selectable integer/non-integer division 10 1978
4,856,032 High speed programmable frequency divider and PLL 12 1987
 
ALLIED CORPORATION (1)
4,555,793 Averaging non-integer frequency division apparatus 10 1983
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
4,807,266 Circuit and method for performing equal duty cycle odd value clock division and clock synchronization 13 1987
 
ITT DEFENSE COMMUNICATIONS, A DIVISION OF ITT CORPORATION (1)
4,837,721 Digital divider with integer and fractional division capability 6 1986
 
MEGATEST CORPORATION (1)
4,809,221 Timing signal generator 33 1988
 
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (1)
4,633,194 Digital frequency divider suitable for a frequency synthesizer 24 1981
 
TEKTRONIX, INC. (1)
4,773,031 Method and circuit for digital frequency multiplication 15 1984
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE ARMY (1)
4,658,406 Digital frequency divider or synthesizer and applications thereof 23 1985

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
THE DOW CHEMICAL COMPANY (4)
5,428,769 Process control interface system having triply redundant remote field units 43 1992
5,970,226 Method of non-intrusive testing for a process control interface system having triply redundant remote field units 8 1995
6,061,809 Process control interface system having triply redundant remote field units 12 1996
5,862,315 Process control interface system having triply redundant remote field units 15 1997
 
FREESCALE SEMICONDUCTOR, INC. (2)
5,748,949 Counter having programmable periods and method therefor 17 1996
6,065,140 Optimized computation of first and second divider values for a phase locked loop system 3 1997
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
5,594,895 Method and apparatus for switching between clock generators only when activity on a bus can be stopped 4 1995
6,879,654 Non-integer frequency divider circuit 7 2003
 
MIRANOVA SYSTEMS, INC. (2)
7,349,821 Bi-directional signal converter 0 2004
7,336,756 Reprogrammable bi-directional signal converter 0 2005
 
RESONANCE SEMICONDUCTOR CORPORATION (2)
7,724,097 Direct digital synthesizer for reference frequency generation 1 2008
8,242,850 Direct digital synthesizer for reference frequency generation 0 2010
 
ALTERA CORPORATION (1)
6,114,915 Programmable wide-range frequency synthesizer 57 1999
 
FAUST COMMUNICATIONS, LLC (1)
5,970,110 Precise, low-jitter fractional divider using counter of rotating clock phases 67 1998
 
MEDIATEK INC. (1)
8,149,022 Digital delay line based frequency synthesizer 0 2008
 
NEC ELECTRONICS CORPORATION (1)
5,479,412 Apparatus for testing counter circuit 0 1993
 
PC PERIPHERALS INC. (1)
6,725,245 High speed programmable counter architecture 5 2002
 
RAYTHEON COMPANY (1)
6,975,682 Multi-bit delta-sigma analog-to-digital converter with error shaping 11 2001
 
SONY ELECTRONICS INC. (1)
8,131,242 System and method for implementing a swap function for an IQ generator 0 2008
 
STMICROELECTRONICS PVT. LTD. (1)
7,231,012 Programmable frequency divider 0 2005
 
SUN MICROSYSTEMS, INC. (1)
6,611,573 Non-integer division of frequency 2 2001