A 40-44 Gb/s 3 × oversampling CMOS CDR/1:16 DEMUX

Nikola Nedovic, Nestoras Tzartzanis, Hirotaka Tamura, Francis M. Rotella, Magnus Wiklund, Yuma Mizutani, Yusuke Okaniwa, Tadahiro Kuroda, Junji Ogawa, William W. Walker

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A CMOS CDR and 1:16 demux fabricated in a low-cost 90 nm bulk CMOS process operates at 40-44 Gb/s and dissipates 910 mW. A quarter-rate hybrid phase-tracking/3 × blind-oversampling architecture is used to improve jitter tolerance, reduce the need for high-power CML circuits, and enable frequency acquisition without a reference clock. Input data are sampled using a 24-phase distributed VCO, and a digital CDR recovers 16 bits and a 2.5 GHz clock from 48 demultiplexed samples spanning 16 UI. Conformance to the ITU-T G.8251 jitter tolerance mask (BER < 10-12 with a 231-1 PRBS source) is demonstrated using both an on-chip and an external BERT.

Original languageEnglish
Article number4381457
Pages (from-to)2726-2735
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Issue number12
Publication statusPublished - 2007 Dec
Externally publishedYes


  • CML
  • CMOS
  • Clock and data recovery (CDR)
  • Delay line
  • Demultiplexer
  • Distributed VCO
  • Distributed circuits
  • Hybrid CDR
  • Jitter tolerance
  • Optical communications
  • Oversam-pling
  • Serializer-deserializer

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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