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Spread spectrum clock generator having an adjustable delay line

  • US 7,680,173 B2
  • Filed: 06/30/2006
  • Issued: 03/16/2010
  • Est. Priority Date: 07/06/2005
  • Status: Active Grant
First Claim
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1. A spread spectrum clock generation circuit comprising:

  • a delay line configured to spread the spectrum of a reference clock signal having a reference clock frequency;

    a delay circuit configured to generate an adjustment signal to the delay line by adding a delay change to or subtracting the delay change from the delay line per cycle of the reference clock frequency, therefore causing a shift in the output clock frequency of the spread spectrum clock generation circuit, wherein the amount of shift is proportional to the rate of addition or subtraction of the delay change.

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