Current-mode fractional low- and high-pass filters using current conveyors

In this paper the current-mode low- and high-pass filters employing current conveyors as active elements are presented, whereas the proposed solutions are suitable for the approximation of fractional-order transfer function of the order (1+α), for 0 < α < 1. The advantageous features of the proposed solutions is the usage of minimal number of passive elements, whereas all are grounded, and ideally zero-input and infinite-output impedance. Based on the theoretical behavior description, the performance of the proposed circuits was verified by means of Spice simulations using macro models of the UCC-N1B integrated circuit.