A time-variant analysis of fundamental 1/f3 phase noise in CMOS parallel LC-tank quadrature oscillators

Authors:
Andrea Mazzanti;Pietro Andreani
Affiliations:
Dipartimento di Ingegneria dell'Informazione, Università degli Studi di Modena e Reggio Emilia, Modena, Italy;Department of Electrical and Information Technology, Lund University, Lund, Sweden
Venue:
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Year:
2009

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Cited 1

On the theory of quadrature oscillations obtained through parallel LC VCOs

IEEE Transactions on Circuits and Systems Part I: Regular Papers - Special section on 2009 IEEE custom integrated circuits conference

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Abstract

This paper presents a rigorous time-variant analysis of the 1/f MOS device noise upconversion into 1/f3 phase noise for two of the most popular parallel-coupled quadrature CMOS harmonic oscillators. Simple closed-form equations for the fundamental 1/f3 phase-noise spectrum are derived and validated through SpectreRF simulations, proving that the two topologies display remarkably different sensitivities to the low-frequency noise sources. Based on the developed analysis, useful general design insights are also presented.