(An) active biquadratic building block without external capacitors

Abstract

A new configuration requiring no external capacitors in the realization of biquadratic voltage transfer function is developed. The proposed network contains resistors and two operational amplifiers represented by the one-pole rolloff model. It has very low sensitivities with respect to all passive and active parameters, and is suitable for medium-Q and high- frequency applications. Especially, the circuit may serve as a versatile second-order building block. Laboratory experiments confirm the validity of the theory and demonstrate the versatility of the circuit as the biquadratic building block.