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Clock- and Data-Recovery Circuit With Independently Controlled Eye-Tracking Loop for High-Speed Graphic DRAMs

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2 Author(s)
Jun-Yong Song ; Dept. of Electron. & Comput. Eng., Hanyang Univ., Seoul, South Korea ; Oh-Kyong Kwon

An independently controlled eye-tracking clock- and data-recovery (CDR) circuit that achieves enhanced high-frequency jitter tolerance is presented in this brief. In the proposed CDR, a data-tracking loop compensates interchannel timing skews and rejects low-frequency jitter of the data, and an eye-tracking loop tracks asymmetric jitter distribution and high-frequency jitter of the data to enhance high-frequency jitter tolerance. This can be achieved by independently controlling two loops in the digital domain. The CDR is implemented using an 0.18- μm CMOS process, and a bit error rate of less than 10-12 was achieved for a data rate up to 5.8 Gb/s using a 231 - 1 pseudorandom binary-sequence input.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:58 ,  Issue: 7 )