A 12-Gb/s Baud-rate Clock and Data Recovery with 75% Phase-detection Probability by Precoding and Integration-Hold-Reset Frontend

Abstract

This paper describes a 12-Gb/s quarter-rate receiver with a current-integrating baud-rate clock and data recovery (CDR) technique. The proposed CDR receives a pre-encoded non-return-to-zero (NRZ) data stream and integrates with 0.5-UI phase offset to extract the phase information. By sampling three consecutive symbols with multiple thresholds in the proposed phase detector, the CDR achieves a 75% phase-detection probability, which is the highest among baud-rate CDRs and leads to a better tracking bandwidth and jitter tolerance. The 12-Gb/s baud-rate CDR prototype is implemented in a 28 nm CMOS process and consumes 77 mW from a 1.2-V supply.