Electronically tunable voltage-mode multifunction biquad filter using single CCTA

Abstract

A configuration based on single current conveyor trans-conductance amplifier (CCTA), three resistors, and two grounded capacitors is presented for the simultaneous realization of second order voltage-mode low pass (LP), band pass (BP), band reject (BR) and all-pass (AP) filtering functions using single voltage input signal. The circuit is canonical by way of using only two capacitors and possesses low active and passive sensitivity. Moreover, both ω0 and Q can be electronically controlled by the bias currents of the CCTA. PSPICE simulation results using CMOS implementation of CCTA are shown for the testability of the proposed circuit. © 2013 IEEE.