Digital spread spectrum method based on precise phase delta-sigma algorithm

摘要

A method and apparatus for generating a spread spectrum reference clock is presented. A method and apparatus is presented for receiving a spread spectrum parameter from a phase lock loop, wherein the spread spectrum parameter includes a multiple-level parameter comprising a plurality of phase signals; quantizing a spread spectrum profile associated with the spread spectrum parameter; mapping the quantized profile; generating control signals based on the mapping, wherein the control signals include an integer control signal and a phase control signal; dividing a phase signal of the plurality of phase signals with the integer control signal; synchronizing the divided phase signal using the phase control signal; and providing a reference clock for a spread spectrum clock generator based on the synchronizing.