A switched-capacitor filter having very low sensitivity tocapacitance ratio errors and to finite amplifier gains

摘要

A number of circuit topologies have been proposed for thenrealization of low sensitivity switched-capacitor filters. One suchnapproach is based on a parallel connection of two allpass sections sonthat low sensitivity with respect to capacitance ratios is achieved. Annimproved version of that implementation is proposed in this brief,nresulting in a structure that has very low sensitivity to capacitancenratio errors and to operational amplifier finite gains. These propertiesnhave been verified by computer simulations, also included in the paper