A time-variant analysis of the 1/f^(2) phase noise in CMOS parallel LC-Tank quadrature oscillators

Pietro Andreani

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Abstract

This paper presents a study of 1/f2 phase noise in quadrature oscillators built by connecting two differential LC-tank oscillators in a parallel fashion. The analysis clearly demonstrates the necessity of adopting a time-variant theory of phase noise, where a more simplistic, time-invariant approach fails to explain numerical simulation results even at the qualitative level. Two topologies of 5-GHz parallel quadrature oscillators are considered, and compact but nevertheless highly general, closed-form formulas are derived for the phase noise caused by the losses in the LC-tanks and by the noisy currents in the MOS transistors. A large number of spectreRF simulations, covering a wide range of working conditions for the oscillators, is used to validate the theoretical analysis.
Original languageEnglish
JournalI E E E Transactions on Circuits and Systems Part 1: Regular Papers
Volume53
Issue number8
Pages (from-to)1749-1760
ISSN1549-8328
DOIs
Publication statusPublished - 2006

Bibliographical note

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Keywords

  • CMOS
  • LC-tank
  • oscillators
  • phase noise
  • quadrature

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