Voltage-Mode and Current-Mode Universal Filter Using IC LT1228

The novelty of the paper is an electronically tunable second-order voltage-mode and current-mode universal filter employing commercially available IC LT1228 and passive components. The low-pass (LP), high-pass (HP), band-pass (BP), notch, and all-pass (AP) responses are realized using voltage-mode and current-mode second-order universal filters. The DC bias currents can be electronically modified to change the natural frequency of the presented arrangement. Furthermore, the voltage and current gain of filters can be adjusted. The Cadence OrCAD PSpice simulation is used to verify the theoretically described performance of the proposed filters.