Hybrid clock and data recovery circuit and system including the same

Abstract

A clock data recovery circuit includes a sampler to sample incoming data bits, a phase detector to generate an edge position signal and a polarity signal based on the sampled incoming data, a finite state machine to save a current edge position state, a polarity decision unit to generate a polarity inversion signal to invert the polarity signal, a gain controller to generate a tracking bandwidth signal, a recovery loop configured to adjust an edge offset of the reference clock, and a bit selector configured to recover the incoming data. The clock data recovery circuit has a first latency at a first operation mode and a second latency at a second operation mode. The phase detector in the clock data recovery circuit may include a first phase detector and a second detector combined together for a low latency and low lock time of the clock data recovery circuit.