Digitally controlled CMOS quadrature ring oscillator with improved FoM for GHz range all-digital phase-locked loop applications

R. K. Pokharel, P. Nugroho, A. Anand, K. Kanaya, K. Yoshida

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

7 Citations (Scopus)

Abstract

This paper presents a 14-bit digitally controlled ring oscillator (DCO) with operating frequency up to 3.4 GHz in 0.18 μm CMOS technology. Digital control is employed to control the transistor operation to obtain higher voltage swing and lower flicker (1/f) noise that in turn results in the lowest phase noise in a ring oscillator. Furthermore, sub-feedback topology is used to obtain the stable quadrature outputs from even number of stages. The DCO has a frequency tuning from 523 MHz to 3.405 GHz. Phase noise at 4 MHz offset is 134.82 dBc/Hz. This results in figure of merit (FoM) to be 169.9 dBc/Hz which is 7.7 dB improvement over its recently published analog counterpart.

Original languageEnglish
Title of host publicationIMS 2012 - 2012 IEEE MTT-S International Microwave Symposium
DOIs
Publication statusPublished - Oct 3 2012
Event2012 IEEE MTT-S International Microwave Symposium, IMS 2012 - Montreal, QC, Canada
Duration: Jun 17 2012Jun 22 2012

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X

Other

Other2012 IEEE MTT-S International Microwave Symposium, IMS 2012
CountryCanada
CityMontreal, QC
Period6/17/126/22/12

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Pokharel, R. K., Nugroho, P., Anand, A., Kanaya, K., & Yoshida, K. (2012). Digitally controlled CMOS quadrature ring oscillator with improved FoM for GHz range all-digital phase-locked loop applications. In IMS 2012 - 2012 IEEE MTT-S International Microwave Symposium [6259730] (IEEE MTT-S International Microwave Symposium Digest). https://doi.org/10.1109/MWSYM.2012.6259730