New Realizations of Current-Mode and Voltage-Mode Multifunction Filters without External Passive Elements

Abstract In this paper new voltage-mode and current-mode multifunction filters using internally compensated operational amplifiers (OP-AMPs) and single output operational transconductance amplifiers (OTAs) are presented. The proposed voltage mode multifunction filter can realize lowpass, bandpass, highpass responses simultaneously and the current-mode multifunction filter can realize lowpass, bandpass, highpass and bandstop responses simultaneously all at high output impedances. No external passive elements are required thus the circuit is suitable for monolithic implementation either with CMOS or bipolar technologies. All of active sensitivities are low. The performances of the circuits are tested using SPICE simulation program.