Wide-range tracking technique for process-variation-robust clock and data recovery applications

2017, Volume 18, Issue 5

Abstract

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Frontiers of Information Technology & Electronic Engineering >> 2017, Volume 18, Issue 5 doi: 10.1631/FITEE.1500410

Wide-range tracking technique for process-variation-robust clock and data recovery applications

. Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China.. University of Chinese Academy of Sciences, Beijing 100029, China

Available online: 2017-06-22

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Abstract

A wide-range tracking technique for clock and data recovery (CDR) circuit is presented. Compared to the traditional technique, a digital CDR controller with calibration is adopted to extend the tracking range. Because of the use of digital circuits in the design, CDR is not sensitive to process and power supply variations. To verify the technique, the whole CDR circuit is implemented using 65-nm CMOS technology. Measurements show that the tracking range of CDR is greater than ±6×10 at 5 Gb/s. The receiver has good jitter tolerance performance and achieves a bit error rate of<10 . The re-timed and re-multiplexed serial data has a root-mean-square jitter of 6.7 ps.

Keywords

Clock and data recovery ; Digital loop filter ; Phase interpolator

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