Spread spectrum clock generator

Details Spread spectrum clock generator Spread spectrum clock generator

2004-07-30

2008-08-12

Ha, Dac V. (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S376000, C327S147000, C327S156000

Reexamination Certificate

active

07412019

ABSTRACT:
A spread spectrum clock generator comprising a phase-locked loop circuit and a modulation circuit. The phase-locked loop circuit receives a reference signal at a reference frequency and outputs an output signal at an output frequency periodically varying in a range between upper predetermined boundary and lower predetermined boundary frequencies. The modulation circuit receives the reference and the output signals, controls a period of the output frequency according to the reference frequency, and modulates a variation rate of the output frequency according to the reference frequency, and the output frequency, and the predetermined integers.

REFERENCES:
patent: 6104222 (2000-08-01), Embree
patent: 6515553 (2003-02-01), Filiol et al.
patent: 7012470 (2006-03-01), Suzuki et al.
patent: 7039149 (2006-05-01), Tagami
patent: 7042258 (2006-05-01), Booth et al.
patent: 7203262 (2007-04-01), Moy et al.

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