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US 7,680,173 B2Granted
Spread spectrum clock generator having an adjustable delay line
AssigneeESS Technology, Inc.
InventorsAndrew Martin Mallinson, Simon Damphousse
Life of this patent
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Abstract
A system and method are provided for performing a spread spectrum clock generation, where the system includes self-adjusting delay line configured to spread the spectrum of a fixed circuit using a fixed clock frequency and a delay circuit configured to generate an adjustment signal to the delay line by adding or subtracting an addition delay per cycle, therefore causing a shift in the output clock frequency, wherein the amount of shift is proportional to the rate of addition or subtraction of delay.
Claims12
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.
Dependencies are inferred from the claim text.