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

A number of circuit topologies have been proposed for the realization of low sensitivity switched-capacitor filters. One such approach is based on a parallel connection of two allpass sections so that low sensitivity with respect to capacitance ratios is achieved. An improved version of that implementation is proposed in this brief, resulting in a structure that has very low sensitivity to capacitance ratio errors and to operational amplifier finite gains. These properties have been verified by computer simulations, also included in the paper.