Abstract:
This article presents a current-mode multifunction biquadratic filter performing
completely standard functions low-pass, high-pass, band-pass, band-reject and
all-pass functions. The circuit principle is based on current controlled current conveyor
transconductance amplifiers (CC-CCTAs) with three input terminals and one
output terminal. The features of the circuit are that, the pole frequency and quality
factor can be electronically tuned via the input bias currents. The circuit topology
is very simple, consisting of merely 2 CC-CCTAs and 2 grounded capacitors, without
any external resistor and using only grounded elements. The proposed circuit
is very suitable to further develop into an integrated circuit architecture. The PSpice
simulation results agree well with the theoretical anticipation. The total power
consumption is approximately 7.93mW on power supply voltage of ±3V.