FSSA: fast steady-state algorithm for the analysis of mixed analog/digital circuits
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Improved small-signal analysis for circuits working in periodic steady state
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Time-domain analysis of phase-noise and jitter in oscillators due to white and colored noise sources
International Journal of Circuit Theory and Applications
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In this paper it is shown that a numerical method largely adopted for the simulation of noise in autonomous circuits is affected by singularities that manifest when the frequency at which the noise analysis is carried out approaches a harmonic of the autonomous circuit. The resulting noise power spectral density (PSD) is thus characterized by spurious spikes. The presence of these singularities is for the first time justified from an analytical standpoint and their effects are shown by simulating some oscillators, employed as benchmarks. Furthermore, the presented approach justifies the 1-(fs-f)2 shape of the PSD of noise at the output when the fs frequency approaches the f fundamental of a stable oscillator and the 1-|fs-f|3 shape when the effects of flicker noise are manifest. Copyright © 2009 John Wiley & Sons, Ltd.