Electronically Tunable VDTA-Based Multi-function Inverse Filter

Abstract

An electronically tunable realization of voltage differencing transconductance amplifier (VDTA)-based multi-function inverse filter circuit is proposed in this letter. Various responses namely inverse low pass, inverse high pass, inverse band pass, and inverse band reject are achieved through switch settings. The proposed circuit uses only grounded capacitors and adds electronic tunability to filter parameters through bias currents of VDTA. SPICE simulations using TSMC 180 nm CMOS technology parameter are carried out to examine operation, total harmonic distortion and noise performance of proposal. Monte Carlo simulations are performed to study performance of the proposal under simultaneous variation in passive component values, oxide thickness and transistor threshold voltage.