Novel Design Solution of Reconnection-less Electronically Reconfigurable Filter

Abstract

The paper presents a new design solution of a reconnection-less electronically reconfigurable filter (no manual reconnection or topology change is necessary) offering all standard 2nd-order transfer functions (low pass, band pass, high pass, band stop and all pass). The filter can also provide highpass and low-pass function with transfer zero (HPZ, LPZ), direct transfer and high-pass function of the lst-order. The design is based on well-known operational transconductance amplifiers (OTAs) and adjustable current amplifiers (ACAs). Moreover, the electronic control of the pole frequency and quality factor of the filter are available. The proposal is verified by PSpice simulations using commercially available devices.