Device and method for NRZ CDR calibration

摘要

The disclosure is a device and a method for Non Return to Zero (NRZ) Clock Data Recovery (CDR) calibration, which includes a CDR unit and a weight calculator unit. The CDR unit receives a compensative signal of an equalization filter to generate an error signal, a sampling clock signal, a transition sampling signal and a data signal. The weight calculator unit receives the error signal, the transition sampling signal and the data signal, and then uses a run length technique to generate weight data. The weight data controls a voltage control oscillator (VCO) which calibrates the phase and the frequency of the sampling clock signal.

主权项

1. A device for Non Return to Zero (NRZ) Clock Data Recovery (CDR) calibration, comprising:
a CDR unit, for receiving a compensative signal to generate a sampling clock signal, a data signal, an error signal and a transition sampling signal, the error signal being output from the CDR unit; and a weight calculator unit, separate and distinct from the CDR unit, coupled to the CDR unit, and configured to receive the error signal and the data signal and then performing weight calculation to generate a weight data; wherein the CDR unit adjusts the sampling clock signal according to the weight data.