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A fully integrated clock and data recovery circuit (CDR) using a multiplying shifted-averaging delay locked loop and a rate-detection circuit is presented. It can achieve wide range and low jitter operation. A duty-cycle-insensitive phase detector is also proposed to mitigate the dependency on clock duty cycle variations. The experimental prototype has been fabricated in a 0.25-μm 1P5M CMOS technology and occupies an active area of 2.89 mm2. The measured CDR could operate from 125 Mb/s to 2.0 Gb/s with a bit error rate better than 10-12 from a 2.5-V supply. Over the entire operating frequency range, the maximum rms jitter of the recovered clock is less than 4 ps.
Circuits and Systems I: Regular Papers, IEEE Transactions on (Volume:51 , Issue: 12 )
Date of Publication: Dec. 2004