Current Feedback Operational Amplifier Based Active Filter Configuration

Abstract

In this paper, a Current Feedback Operational Amplifier (CFOA) based active filter configuration has been proposed. The described circuit topology employs two CFOAs and five admittances to realize an active Low Pass Filter (LPF), a Band Pass Filter (BPF) and a High Pass Filter (HPF) by appropriate admittance selection. In all the derived filter circuits, grounded and virtually grounded capacitors are being used, as it is preferred for IC implementation, for the design of filter circuits. To demonstrate the practicability of the proposed configuration, PSPICE simulation results are used, which match closely with the theoretical response obtained by using MATLAB. Experimental results using commercially available off-the-shelf CFOA IC AD844 have also been included to support the theoretical and simulated results.