8-Gb/s source-synchronous I/O Link with adaptive receiver equalization, offset cancellation, and clock de-skew

James E. Jaussi, Ganesh Balamurugan, David R. Johnson, Bryan Casper, Aaron Martin, Joseph Kennedy, Naresh R Shanbhag, Randy Mooney

Research output: Contribution to journalArticle


A source-synchronous I/O link with adaptive receiver-side equalization has been implemented in 0.13-μm bulk CMOS technology. The transceiver is optimized for small area (360 μm × 360μm) and low power (280 mW). The analog equalizer is implemented as an 8-way interleaved, 4-tap discrete-time linear filter. The equalization improved the data rate of a 102 cm backplane interconnect by 110%. On-die adaptive logic determines optimal receiver settings through comparator offset cancellation, data alignment of the transmitter and receiver, clock de-skew and setting filter coefficients for equalization. The noise-margin degradation due to statistical variation in converged coefficient values was less than 3%.

Original languageEnglish (US)
Pages (from-to)80-87
Number of pages8
JournalIEEE Journal of Solid-State Circuits
Issue number1
StatePublished - Jan 1 2005



  • Adaptive equalizers
  • Analog equalization
  • High-speed I/O
  • Offset cancellation
  • Transceivers
  • Waveform capture

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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