Design automation for integrated continuous-time filters using integrators

Abstract

This paper proposes a design automation for filters using integrators. This is based on a predistortion without knowledge of a filter topology. The predistortion requires an integrator having the same structure, the same-value elements and an electrically controllable unity-gain frequency, and compensates for the deviation of frequency characteristics due to an excess phase shift of an integrator. The effectiveness of the proposed method is demonstrated through SPICE simulations. An algorithm for a filter design automation is also discussed.