Abstract
This article presents a dual-mode (voltage-mode and
current-mode) universal biquadratic filter performing
completely standard functions: lowpass, highpass, bandpass,
band-reject, and allpass functions, based on plus-type
dual-output second-generation, current controlled, current
conveyor (DO-CCCII+). The features of the circuit are that
the bandwidth and natural frequency can be tuned
electronically via the input bias currents: the circuit
description is very simple, consisting of merely 2 DO-CCCIIs
and 2 capacitors: the circuit can provide either the
voltage-mode or current-mode filter without changing circuit
topology. Additionally, each function response can be selected
by suitably selecting input signals with digital method.
Without any external resistors, the proposed circuit is very
suitable to further develop into an integrated circuit. The
PSPICE simulation results are depicted. The given results
agree well with the theoretical anticipation. The maximum
power consumption is approximately 1.81 mW at