A 1.69-pJ/b 14-Gb/s Digital Sub-Sampling CDR with Combined Adaptive Equalizer and Self-Error Corrector

Yoonjae Choi, Sewook Hwang, Yeonho Lee, Hyunsu Park, Jonghyuck Choi, Jincheol Sim, Chulwoo Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper presents an area- and energy- efficient digital sub-sampling clock and data recovery (CDR) with combined adaptive equalizer and self-error corrector (SEC). Using the digitized phase difference between the incoming data and the full-rate output clock of a digitally controlled oscillator (DCO) for both the equalizer adaptation and clock recovery loop, the proposed adaptive equalizer is combined with the CDR by sharing its adaptation loop including a sub-sampling phase detector (SSPD) and a digital logic circuit. Consequently, the active area and power dissipation for the adaptive equalizer are reduced. Furthermore, the SEC is proposed to improve the high-frequency jitter tolerance of the CDR. The SEC detects bit errors by observing the comparator decision and corrects the errors without any data encoding or complicate circuits. The out-of-band jitter tolerance is improved by 22.6% at 100 MHz for 17.2-dB loss channel with <10-12 bit-error rate (BER) with the proposed SEC. The SEC is applicable to various receivers with compact design at a low cost. The prototype receiver consumes 23.9 mW at 14-Gb/s and occupies 0.007 mm2 in a 28-nm CMOS technology.

Original languageEnglish
Article number9521897
Pages (from-to)118907-118918
Number of pages12
JournalIEEE Access
Publication statusPublished - 2021


  • Adaptive equalizer
  • clock and data recovery (CDR)
  • continuous-time linear equalizer (CTLE)
  • decision feedback equalizer (DFE)
  • jitter tolerance
  • receiver
  • self-error corrector (SEC)
  • sub-sampling

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


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