Efficient AC analysis of oscillators using least-squares methods

Authors:
Ting Mei;Jaijeet Roychowdhury
Affiliations:
University of Minnesota, Twin Cities;University of Minnesota, Twin Cities
Venue:
Proceedings of the conference on Design, automation and test in Europe: Proceedings
Year:
2006

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Abstract

We present a generalization of standard AC analysis to oscillators by exploiting least-squares solution techniques. This provides an attractive alternative to the current practice of employing transient simulation for small signal analysis of oscillators. Unlike phase condition based oscillator analysis techniques, which suffer from numerical artifacts, the least-squares approach of this paper results in a robust and efficient oscillator AC technique. We validate our method on LC and ring oscillators, obtaining speedups of 1-3 orders of magnitude over transient simulation, and 4-6 over phase-condition-based techniques.