A 5.4Gb/s adaptive equalizer using asynchronous-sampling histograms

Wang Soo Kim, Chang Kyung Seong, Woo Young Choi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Citations (Scopus)


As the data rate requirements for many wireline applications increase, channel bandwidth limitation becomes a critical problem in serial interfaces. Equalizers are often used as a solution for this problem. In addition, many applications require the equalizer to be adaptive so that it can provide optimized equalization for different channel conditions. Various types of adaptive equalizers have been investigated for high-speed serial interface applications [1-6]. In the spectrum-balancing method, adaptive equalization is achieved by comparing high and low frequency components of signal power and generating feedback signals until the power spectrum is balanced [1]. Unfortunately, the precision of this scheme is easily affected by process variations, and capacitors both in filters and the feedback loop occupy a large Si area. Digital-signal processing based on maximum likelihood sequence detection can be used for adaptive equalization [2]. But, speed limitation and architecture complexity of ADC limits applicability of this scheme in high-speed applications. In the eye-opening monitoring (EOM) scheme, quality of the signal eye diagram is measured and used for equalizer adaptation [3-6]. For this method, a clock-recovery circuit is needed in order to generate clock signals synchronized to data for sampling. However, it can be difficult to recover clock signals from the initially closed eye diagram, limiting the applicability of this scheme. In this paper, we demonstrate an adaptive equalizer based on asynchronous-sampling histograms.

Original languageEnglish
Title of host publication2011 IEEE International Solid-State Circuits Conference - Digest of Technical Papers, ISSCC 2011
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Print)9781612843001
Publication statusPublished - 2011
Event2011 IEEE International Solid-State Circuits Conference, ISSCC 2011 - San Francisco, CA, United States
Duration: 2011 Feb 202011 Feb 24

Publication series

NameDigest of Technical Papers - IEEE International Solid-State Circuits Conference
ISSN (Print)0193-6530


Other2011 IEEE International Solid-State Circuits Conference, ISSCC 2011
Country/TerritoryUnited States
CitySan Francisco, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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