Clock & Data Recovery - CDR

A Clock and Data Recovery (CDR) device is used to extract or recover the clock signal and data embedded in the transition. The data is transmitted or retrieved without any additional timing reference in general systems. In digital systems data is serialized and encoded before transmitting, and is transmitted with its clock information. At the receiving end, the signal is restored and the timing information and data is extracted. Electronic circuits that accomplish the extraction functions inside the data receiver are called the Clock and Data Recovery devices.