Patent ID: 8284816
Filing Date: 2012-10-09
Classification: H04B

Abstract:
1. A system for generating a spread spectrum clock signal, comprising: a reference clock signal modulator configured to generate a modulated reference clock signal by modulating a reference clock signal based on a spread spectrum frequency profile, the reference clock signal modulator further configured to generate a modulation direction signal indicating a modulation frequency direction of the spread spectrum frequency profile; a phase-lock loop coupled to the reference clock signal modulator and configured to generate a loop phase error signal indicating a phase difference between the modulated reference clock signal and a spread spectrum clock signal, the phase-lock loop further configured to generate the spread spectrum clock signal based on the modulated reference clock signal and a loop modulation signal; and a loop modulator coupled to the reference clock signal modulator and the phase-lock loop, the loop modulator configured to generate the loop modulation signal based on the modulation direction signal and the loop phase error signal for minimizing a phase-modulation amplitude difference between a phase-modulation amplitude of the modulated reference clock signal and a phase-modulation amplitude of the spread spectrum clock signal.