Evaluating the frequency limitations of operational amplifier RC networks: the dominant pole technique and its applications to inductance simulators

Abstract

A general computer-based technique is given for investigating the high frequency performance of second-order active RC networks employing an arbitrary number of operational amplifiers. It uses the dominant-pole technique for finding deviations in Q and ω _o from their nominal values as a function of the gain-bandwidth product of the operational amplifiers. The technique is applied to active RC circuits simulating a nonideal grounded inductance and curves are given for the highest usable frequency for permissible deviation in Q and ω _o for some typical circuits.