Patent ID: 7315602
Filing Date: 2008-01-01
Classification: H03L,H04B

Abstract:
1. A digital spread spectrum frequency synthesizer, comprising: a divider for receiving a reference clock with a substantially fixed period and generating an output clock with a time-varying period; a noise-shaped quantizer for quantizing a period control word to a time-varying value in response to said output clock fed from said divider so that said divider generates said output clock by means of dividing said reference clock by said time-varying value; means for adjusting said period control word in response to said output clock, wherein said period control word is within a period range with reference to a period nominal; wherein said means for adjusting said period control comprises: an offset generator for generating a period offset in response to said output clock and an adder for generating a period offset in response to said output clock; and an adder for generating said adjusted period control word by means of adding said period offset to said period nominal; and a filter for substantially filtering out jitter from said output clock.