Current-mode universal biquadratic circuit using OTAs and DO-CCII

This paper presents a realization of current-mode universal biquadratic circuit using operational transconductance amplifiers (OTAs) and dual current output second generation current conveyor (DO-CCII). The proposed circuit is constructed with two multiple current output OTAs (MO-OTAs), a OTA, a DO-CCII and two grounded capacitors. The circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass transfer functions by suitably choosing the current outputs without any component matching conditions. The circuit parameters ω₀, Q can also be tuned orthogonally through adjusting the bias currents of the OTAs. The biquadratic circuit enjoys very low sensitivities with respect to the circuit components. The circuit configuration is very suitable for implementation in both bipolar and CMOS technology. An example is given together with simulated results by PSPICE.