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.
A Time-Variant Analysis of Fundamental 1/f3 Phase Noise in CMOS Parallel LC-Tank Quadrature Oscillators
MAZZANTI, ANDREA;ANDREANI, PIETRO
2009-01-01
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.File in questo prodotto:
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