Abstract
This paper presents SC circuits for realizing an arbitrary <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</tex> th-order filter function using any number of op-amps, from 1 to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</tex> . The reduced op-amp. count is obtained at the cost of an increased number of clock phases. Low-noise and low-sensitivity structures are obtained by applying the recently proposed methods of Intermediate-Function Synthesis. An experimental prototype of a 5th-order low-pass filter example is used to verify the proposed multiplexing scheme.
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