A CLOCK DATA RECOVERY CIRCUIT, AND A METHOD OF OPERATING THE SAME

摘要

A method for operating a clock data recovery circuit according to an embodiment of the present invention may include the following steps: obtaining a frequency by generating an automatic process compensation (APC) code which uniformly controls change of frequency per bit of an automatic frequency control (AFC) code which changes a frequency of a recovery clock signal, and the AFC code which makes the frequency of the recovery clock signal approximate to a target frequency; and phase-tracking the phase of the recovery clock signal to be as closely as possible to the phase of serial data according to an up fine tuning code and a down fine tuning code generated by combining a proportional path and an integration path.