Computation of noise spectral density in switched capacitor circuits using the mixed-frequency-time technique

  • Authors:
  • V. Vasudevan;M. Ramakrishna

  • Affiliations:
  • Indian Institute of Technology-Madras, Chennai-600036, India;Indian Institute of Technology-Madras, Chennai-600036, India

  • Venue:
  • Proceedings of the 40th annual Design Automation Conference
  • Year:
  • 2003

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Abstract

A time-domain algorithm for computation of the noise power spectral density (PSD) is proposed in [17]. When applied to periodically varying circuits, this formulation requires efficient methods to obtain the quasi-periodic steady-state solution of a set of linear time-varying ordinary differential equations. We use both the mixed frequency-time technique(MFT) and the shooting Newton method for this computation. We show that, at each frequency for which the spectral density is sought, MFT requires only two integrations over a duration of the clock period. The results are compared with published experimental and computed data.