High output impedance current-mode universal filter

Abstract

A new current-mode universal filter with single input and three outputs employing two second-generation current conveyors (CCIIs), one current follower (CF) and four grounded/virtually grounded passive elements is presented. The proposed circuit enjoys the following features: simultaneous realization of lowpass(LP), bandpass(BP), and highpass(HP) filtering responses, no need of matching conditions, employment of grounded resistors which are ideal for IC implementation, employment of grounded/virtually grounded capacitors, orthogonal control of ω₀and ω₀/ <i style="">Q</i>, high output impedance suiting cascadibility for higher order filters, and low passive sensitivity. PSPICE simulation results are included, confirming the workability of the proposed circuit.