1985•IEEE Journal of Solid-State CircuitsRequires access

Biquad alternatives for high-frequency switched-capacitor filters

D.B. Ribner, M.A. Copeland

Abstract

Biquad sections are the basic building block of practical switched-capacitor (SC) filters. The authors focus on the amenability of various biquad options for high-frequency operation. A comparison on the basis of analysis and a recent nonideal SC network simulation tool are confirmed by results from a VLSI 1.25-/spl mu/m CMOS test chip. A differencing-input SC biquad is shown to have a significant performance advantage over other circuits.

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Key concepts: Digital biquad filter, Switched capacitor, CMOS, Very-large-scale integration, Computer science, Capacitor, Electronic engineering, Low-pass filter