Abstract:
This article presents a current-mode universal filter performing completely standard functions: low-pass, high-pass, band-pass, band-reject and all-pass functions. The circuit principle is based on multiple-output operational transconductance amplifiers (MO-OTAs). The features of the circuit are the ability of the pole frequency and quality factor which can be electronically tuned via the bias currents. The circuit topology is very simple, it consists of 4 MO-OTAs and 2 grounded capacitors. The proposed circuit is very appropriate to further develop into an integrated circuit architecture. The PSpice simulation results agree well with the theoretical anticipation. The total power consumption is approximately 3.2mW at ±1.5V power supply voltages