Clock generating method and clock generating circuit

Details Clock generating method and clock generating circuit Clock generating method and clock generating circuit

2006-01-13

2009-08-25

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Spread spectrum

C375S376000, C375S152000, C331S010000, C331S011000, C331S017000, C327S156000

Reexamination Certificate

active

07580443

ABSTRACT:
In a clock generating circuit, while a PLL (Phase-Locked Loop) circuit and a modulator are employed, when a frequency dividing ratio of a feedback-purpose frequency divider in the PLL circuit is changed in accordance with modulation data produced based upon a modulation profile of the modulator to perform a frequency modulation so as to spread a spectrum, a turning point of the modulation profile is moved so as to disperse a degree of frequency, so that the spread spectrum is re-spread. Also, a clock generating circuit is constituted by a PLL circuit and a modulator, a multiple modulation profile generating circuit is provided in the modulator, and a turning point of a modulation profile is moved so as to disperse a degree of frequency, so that a spread spectrum is re-spread.

REFERENCES:
patent: 5488627 (1996-01-01), Hardin et al.
patent: 5659587 (1997-08-01), Knierim
patent: 6980581 (2005-12-01), Sha et al.
patent: 7015733 (2006-03-01), Giuroiu
patent: 2005/0008113 (2005-01-01), Kokubo et al.
patent: 2005/0134335 (2005-06-01), Loh
patent: 7-235862 (1995-09-01), None
patent: 2001-202153 (2001-07-01), None
patent: 2004-104655 (2004-04-01), None
K. Hardin et al., “Spread Spectrum Clock Generation for the Reduction of Radiated Emissions,” IEEE, 1994, pp. 227-231.
D. Kim et al., “A Spread Spectrum Clock Generation PLL with Dual-tone Modulation Profile,” 2005 Symposium on VLSI Circuits Digest of Technical Papers, 2005, pp. 96-99.

Affiliated with

Also associated with

Rating

Clock generating method and clock generating circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Clock generating method and clock generating circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clock generating method and clock generating circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4094066