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A time-variant analysis of the 1/f2 phase noise in CMOS parallel LC-tank quadrature oscillators

Publiceringsår: 2006
Språk: Engelska
Sidor: 1749-1760
Publikation/Tidskrift/Serie: IEEE Transactions on Circuits and Systems Part 1: Regular Papers
Volym: 53
Nummer: 8
Dokumenttyp: Artikel i tidskrift
Förlag: IEEE--Institute of Electrical and Electronics Engineers Inc.


This paper presents a study of 1/f/sup 2/ 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.


  • Electrical Engineering, Electronic Engineering, Information Engineering


  • ISSN: 1549-8328

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