Synthesis of Four-terminal RC Active Filters

Abstract

For the synthesis of active filters use of operational amplifiers is well known. In this paper, instead of using expensive operational amplifiers, a new technique is presented in which use has been made of a unity-gain amplifier in conjunction with a 4-terminal RC network for realization of a general class of filters possessing poles and zeroes of any order and anywhere in the complex s-plane excluding the positive real axis.

The synthesis technique is based upon 4-terminal RC network realizability theory. No network has been assumed a priori and hence it is more general and rigorous. The technique has been illustrated by a few numerical examples.