A CDR System Based on Improved Second Order Digital Filter, Hysteretic Voter and Phase Interpolator. Issue 6 (1st November 2019)

• Record Type: Journal Article
• Authors: Zhao, Yuyue; Jiang, Yingdan; Yang, Yu; Shen, Guangzhen; Hu, kai; Yan, Hua
• Is Part Of: Chinese journal of electronics. Volume 28:Issue 6(2019)
• Page Start: 1227
• Page End: 1233
• Publication Date: 2019-11-01
• Subjects: CDRS -- Bang‐bang phase detector(!!PD) -- Hysteretic voter -- Second order digital filter -- Phase interpolator -- Jitter transfer -- Jitter tolerance; clock and data recovery circuits -- digital filters -- jitter -- phase noise -- quantisation (signal) -- transfer functions; current‐switching glitch -- phase resolution -- jitter transfer function -- phase noise -- CDR system -- second order digital filter -- data recovery system -- direct current quantization noise -- quantization step -- hysteresis majority voter -- Phase interpolator; Electronics -- Periodicals; Electronics -- China -- Periodicals; Electronics; China; Periodicals; 621.38105
• DOI: 10.1049/cje.2019.08.006
• Languages: English
• ISSNs: 1022-4653

Abstract

Abstract : The proposed Clock and data recovery system (CDRS) has three improved parts. The second order digital filter with rounding algorithm implements fractional gain and avoids direct current quantization noise which varies between ‐ q /2 and + q /2 while that of traditional filter varies between 0 and + q ( q is quantization step). The hysteresis majority voter can combat high frequency and strong jitter especially in quasi‐steady state. The improved Phase interpolator (PI) has much smaller current‐switching glitch and phase glitch since the weighting current changes gradually instead of steeply. The optimized CDRS can handle up to ±6000ppm (parts per million) frequency offset and the phase resolution is 1.4º/LSB (Least significant bit) according to analysis. The simulations of jitter transfer function and jitter tolerance by Matlab, simulations of phase noise by spectre using Verilog+VeriloA model, and measurements of frequency offset and jitter tolerance all show its good performance.