Phase averaging and interpolation using resistor strings or resistor rings for multi-phase clock generation

Ju Ming Chou*, Yu Tang Hsieh, Jieh-Tsorng Wu

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Circuit techniques using resistor strings (R-strings) and resistor rings (R-rings) for phase averaging and interpolation are described. Phase averaging can reduce phase errors, and phase interpolation can increase the number of available phases. In addition to the waveform shape, the averaging and the interpolation performances of the R-strings and R-rings are determined by the clock frequency normalized by a RC time constant of the circuits. To attain better phase accuracy, a smaller RC time constant is required, but at the expense of larger power dissipation. To demonstrate the resistor ring's capability of phase averaging and interpolation, a 125-MHz 8-bit digital-to-phase converter (DPC) was designed and fabricated using a standard 0.35-μm SPQM CMOS technology. Measurement results show that the DPC attains 8-bit resolution using the proposed phase averaging and interpolation technique.

Original languageEnglish
Pages (from-to)984-991
Number of pages8
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume53
Issue number5
DOIs
StatePublished - 1 May 2006

Keywords

  • Averaging
  • Clocks
  • Delay-locked loops (DLLs)
  • Interpolation
  • Phase-locked loops (PLLs)

Fingerprint Dive into the research topics of 'Phase averaging and interpolation using resistor strings or resistor rings for multi-phase clock generation'. Together they form a unique fingerprint.

  • Cite this