Clock and Data Recovery Using Receiver Clock Spread Spectrum Modulation and Offset Compensation

摘要

A system and method for performing clock and data recovery. The system sets the phase of a recovered clock signal according to at least three estimates of the frequency offset, or rate of change of the frequency offset, between an arriving signal and the recovered clock signal.

主权项

1. A device, comprising:
sampling circuitry configured to sample a signal arriving at the device according to a recovered clock, wherein the signal arriving at the device has a time-varying frequency; frequency information circuitry configured to record, in distinct portions of a memory of the device, three or more distinct digital values, corresponding to frequency offsets, or rates of change of frequency offsets, between the arriving signal and a recovered clock generated by the device, during three or more distinct segments of a modulation period; and clock generation circuitry configured to generate the recovered clock, the clock generation circuitry including circuitry to adjust a frequency or phase of the recovered clock at distinct times in accordance with the recorded distinct digital values.