Design of Fully-Differential Frequency Filter with Fractional-Order Elements

In the paper, a proposal of the fully-differential fractional-order frequency filter with controllability of its parameters is presented. The filter consists of Multi-Output Transconductance Amplifiers (MOTAs), Adjustable Current Amplifier (ACA) as active elements and two pairs of grounded capacitors. The paper contains analysis of the filter with FOEs used instead of classical capacitors in the filter topology. The order of the filter is changed by switching a particular FOEs with required value of the order. The filter possesses the pole frequency and quality factor control. The correctness of the proposed filter is verified by PSpice simulations with behavioural models of theactive elements.