Patent ID: 6993109
Filing Date: 2006-01-31
Classification: G06F,H03L,H04B

Abstract:
1. A method for generating clock signals, comprising: generating a second clock signal based on a first frequency modulated clock signal output from a spread-spectrum clock generator; detecting a phase difference between the second clock signal and the first modulated clock signal; and delaying the second clock signal based on a period of the first frequency modulated clock signal to reduce said phase difference, wherein said delaying includes: (a) measuring the period of the first modulated clock signal; (b) measuring a delay between the second clock signal and the first modulated clock signal; and (c) generating a first control signal to adjust the delay of the second clock signal, to thereby reduce mis-alignment between the second clock signal and the first modulated clock signal, based on results of (a) and (b), wherein the delaying further includes: (d) generating a second control signal from a phase detector to adjust the delay of the second clock signal to thereby reduce mis-alignment between the second clock signal and the first modulated clock signal, said phase detector also detecting said phase difference.