Switched-capacitor non-recursive lowpass filter

Abstract

A new switched-capacitor realization of a non-recursive filter based on the digital filter theorem is proposed. A switched-capacitor realization of the delay circuit is described first. A switched-capacitor coefficient multiplier and adder are based on the integral feedback capacitance circuit. This circuit has the feature that the voltage across the integral feedback capacitance is used for the output voltage, whereas, in an ordinary circuit, the output voltage is used at the output terminal of an operational amplifier. Agreement between experimental and theoretical values is confirmed.