Patent ID: 6292507
Filing Date: 2001-09-18
Classification: H03L,H04B

Abstract:
A method for controlling a spread spectrum clock generator, said method comprising:(a) providing a substantially accurate clock signal to a frequency synthesizer circuit, and providing a controller; said frequency synthesizer generating a plurality of output frequencies over time;(b) measuring an actual pulse-width duration of at least one of an UP signal and a DOWN signal generated by a phase frequency detector of said frequency synthesizer, and comparing said actual pulse-width duration with a predetermined typical time duration to find a difference therebetween, thus deriving a deviation error signal;(c) controlling a physical parameter of said frequency synthesizer, based upon said deviation error signal, to compensate for the difference between said actual pulse-width duration and said predetermined typical time duration, thereby more accurately controlling said frequency synthesizer's plurality of output frequencies over time to emulate a predetermined target spread spectrum profile.