Fractional rate phase detectors for clock and data recovery

A. Seedher, G. E. Sobelman

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

2 Scopus citations


Some recent PLL designs utilize a half-rate phase detector so that the VCO operates at a frequency that is one-half of the input data rate. In this paper, a technique is proposed to extend the half-rate phase detector structure to a rate of 1/2n, for integer n>1. The concept is explained using a rate 1/8 implementation and simulation results are presented to verify the scheme. These rate 1/2n phase detectors can be used to raise the maximum operating frequency of clock and data recovery circuits in a given CMOS process technology.

Original languageEnglish (US)
Title of host publicationProceedings - IEEE International SOC Conference, SOCC 2003
EditorsDong S. Ha, Richard Auletta, John Chickanosky
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)0780381823, 9780780381827
StatePublished - 2003
EventIEEE International SOC Conference, SOCC 2003 - Portland, United States
Duration: Sep 17 2003Sep 20 2003

Publication series

NameProceedings - IEEE International SOC Conference, SOCC 2003


OtherIEEE International SOC Conference, SOCC 2003
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2003 IEEE.


  • CMOS process
  • CMOS technology
  • Circuits
  • Clocks
  • Latches
  • Optical fiber communication
  • Phase detection
  • Phase frequency detector
  • Phase locked loops
  • Voltage-controlled oscillators


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