Universal current-mode filter with multiple inputs and one output using MOCCII and MO-CCCA

In this paper, by introducing a current-controlled current amplifier with multi-outputs (MO-CCCA), two new multi-input and single-output (MISO) universal filtering circuits are proposed. Each circuit just contains two second-generation current conveyors with multiple outputs (MOCCIIs), one MO-CCCA and four grounded RC elements. They can realize low-pass, band-pass, high-pass, band-stop and all-pass filtering outputs. The characteristic parameters natural frequency (ω0ω0) and quality factor (Q)(Q) can be tuned independently by bias current of MO-CCCA. Compared to other similar circuits, the circuits in this paper have simpler structures and independent tuning characteristics of ω0ω0 and Q. Moreover, a filter with a high Q can be obtained by adjusting the ratio of MO-CCCA's bias currents.