Resistance Multiplication in Integrated Circuits by Means of Switching

Abstract

A state-space analysis is given for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RC</tex> networks containing an arbitrary number of periodically operated switches. The results are then applied to the design of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RC</tex> integrated circuits in which large values of resistance are achieved by placing a switch in series with each resistor of small resistance. It is shown that the technique provides excellent desensitivity to environmental change. Finally an experiment verifying the usefulness of the method is described.