05488627 is referenced by 116 patents and cites 23 patents.

A clock circuit includes an oscillator for generating a reference frequency signal, and a spread spectrum clock generator cooperating with the oscillator for generating a spread spectrum clock output signal having a fundamental frequency and reduced amplitude EMI spectral components at harmonics of the fundamental frequency. The spread spectrum clock generator preferably includes a clock pulse generator for generating a series of clock pulses, and a spread spectrum modulator for frequency modulating the clock pulse generator to broaden and flatten amplitudes of EMI spectral components which would otherwise be produced by the clock pulse generator. The spread spectrum modulator frequency modulates the clock pulses with specific profiles of frequency deviation versus the period of the profile. Electronic devices including the spread spectrum clock circuit and associated method are also disclosed.

Title
Spread spectrum clock generator and associated method
Application Number
8/160077
Publication Number
5488627
Application Date
November 29, 1993
Publication Date
January 30, 1996
Inventor
James J Booth
Nicholasville
KY, US
Donald R Bush
Winchester
KY, US
John T Fessler
Lexington
KY, US
Keith B Hardin
Lexington
KY, US
Agent
Bell Seltzer Park & Gibson
Assignee
Lexmark International
CT, US
IPC
H03D 1/04
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