05867524 is referenced by 19 patents and cites 38 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
425832
Publication Number
5867524
Application Date
February 13, 1997
Publication Date
February 2, 1999
Inventor
Keith Bryan Hardin
Lexington
KY, US
John Thomas Fessler
Lexington
KY, US
Donald Reid Bush
Winchester
KY, US
James Ronald Booth
Nicholasville
KY, US
Agent
John A Brady
Assignee
Lexmark International
KY, US
IPC
H04B 15/00
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