An approximate noise computation for general integrator-based sc filters

Josef Goette, August Kaelin, Walter Guggenbühl, George S. Moschytz

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


An approximate measure for the noise performance of integrator-based SC-filters of general order n is developed. The measure is dependent only on SC-design parameters like capacitor ratios and capacitance levels, but not on technology-dependent parameters describing the switches and amplifiers. A simple and explicit closed-form expression for this approximate noise measure is derived and compared with more complex-and accurate-measures. The comparison demonstrates extraordinary accuracy for our approximate noise computation. An important application for our noise measure is in the optimization of integrator-based SC-fdters; it is used in the computer-aided design of sensitivity- and noise-optimized SC filters as described in the companion paper [1].

Original languageEnglish
Pages (from-to)1249-1254
Number of pages6
JournalIEEE Transactions on Circuits and Systems
Issue number11
StatePublished - Nov 1991
Externally publishedYes


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