Jitter transfer analysis of tracked oversampling techniques for multigigabit clock and data recovery

Youngdon Choi, Deog-Kyoon Jeong, Wonchan Kim
2003 IEEE transactions on circuits and systems - 2, Analog and digital signal processing  
Bang-bang controlled clock-recovery is widely used in serial link applications as it offers ideal matching between the timing and data samplers and is amenable to fast digital implementation. However, the bang-bang phase detection discards the magnitude information of the timing error and results in inconsistent loop dynamics that vary with the input-noise characteristics. This paper analyzes the jitter-dependent behavior of the tracked oversampling clock-recovery loop, by introducing the
more » ... troducing the concept of effective phase detector gain. Three methods to stabilize the loop bandwidth against jitter variation are described and compared: adapting the loop gain, increasing the oversampling ratio, and adjusting the sampling points. The analyses are then verified with the jitter transfer characteristics obtained from time-step behavioral simulation. Index Terms-Clock and data recovery (CDR), effective phase detector gain, tracked oversampling.
doi:10.1109/tcsii.2003.819070 fatcat:df2dgcau5nfa3jszgwhz7ofxku