A Wide Lock-Range Referenceless CDR with Automatic Frequency Acquisition

Abstract EN

A wide lock-range referenceless CDR circuit is proposed with an automatic tracking of data rate.

For efficient frequency acquisition, a DLL-based loop is used with a simple phase/frequency detector to extract 1-bit period of input data stream.

The CDR, implemented in a 65 nm CMOS, shows a lock range of 650 Mb/s-to-8 Gb/s and BER of less than 10−12 at 8 Gb/s with low power consumption.