Current-mode multifunction biquad filter with three inputs five outputs using ZC-CDTAs

This paper presents a new current-mode universal filter with three inputs and five outputs using three z-copy current differencing transconductance amplifiers (ZC-CDTAs) and two grounded capacitors. The proposed circuit can realize of low-pass, band-pass, high-pass, band-stop and allpass current responses, without component-matching conditions and inverting-type input signals. The natural frequency and the quality factor can be set orthogonally. The filter also offers the features of low input and high output impedances, low active and passive sensitivities, electronic control of the natural frequency and the use of only grounded capacitors. The characteristics of the proposed circuit are simulated using PSPICE to confirm the presented theory.