Simulation of a voltage-controlled filter

Abstract

A new technique for voltage-controlled filtering is presented in this work. The results to be expected from the technique are analyzed by simulation since the filter can be described analytically only through approximations. The filtering technique is based on a linear system with periodically operated synchronous switches. A hardware model of the filter was built and the digital simulation outputs are compared with those obtained with the hardware. Filtering performances in the simulation and in the hardware were in close agreement. Though only Butterworth filters were considered, the method is expected to have much broader appli cations.