A 20-Gb/s Burst-Mode Clock and Data Recovery Circuit Using Injection-Locking Technique

摘要

A 20-Gb/s clock and data recovery circuit incorporates injection-locking technique to achieve high-speed operation with low power dissipation. The circuit creates spectral line at the frequency of data rate and injection-locks two cascaded LC oscillators. A frequency-monitoring mechanism is employed to ensure a close matching between the VCO natural frequency and data rate. Fabricated in 90-nm CMOS technology, this circuit achieves a bit error rate of less than $10^{-9}$ in both continuous (PRBS of $2^{31}-1$) and burst modes while consuming 175 mW from a 1.5-V supply.