Spread spectrum clock generator

Details Spread spectrum clock generator Spread spectrum clock generator

2005-07-07

2009-11-17

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Spread spectrum

C370S319000, C370S320000, C370S321000, C370S330000, C370S335000, C370S342000, C370S345000, C370S347000, C342S150000, C342S151000, C342S152000, C342S153000, C342S154000, C342S155000, C333S193000, C333S194000, C333S195000, C333S196000

Reexamination Certificate

active

07620094

ABSTRACT:
Disclosed is a spread spectrum clock generator which includes: a first delay control type oscillator that variably controls an oscillation period at a control period interval according to a control signal; a control circuit; a maximum modulation value determination circuit that determines a maximum modulation value from a predetermined value, a frequency control signal, and a given modulation degree setting signal; a modulation signal generation circuit that receives the maximum modulation value from the maximum modulation value determination circuit and generates a modulation control signal within the maximum modulation value; and a second delay control type oscillator that receives a value obtained by adding the modulation control signal from the modulation signal generation circuit to the frequency control signal as a control signal and variably controls the oscillation period of an output clock signal at the control period interval according to the control signal. The control circuit outputs the frequency control signal for variably controlling the oscillation period based on the result of phase comparison between a clock signal obtained by frequency dividing the output of the first delay control type oscillator and a frequency divided clock signal of a reference clock signal, performed by a phase comparator.

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patent: 2004-208037 (2004-07-01), None
Japanese Office Action dated Jan. 7, 2009 with Partial English Translation.

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