Transimpedance type multifunction filter without using any external passive elements

Abstract

In this paper a new trans-impedance mode multifunction filter using opamp compensation poles is presented. The proposed circuit is composed of two internally compensated operational amplifiers (OAs) and four single-output operational transconductance amplifiers (OTAs), without using any external passive elements. The proposed multifunction filter can realize lowpass, bandpass and highpass responses simultaneously. Lowpass and bandpass responses have low output impedances. No matching condition is required. The circuit is suitable for monolithic implementation either with CMOS or bipolar technologies. All of the active sensitivities are low. The performance of the circuit is tested by using SPICE simulation program.