A Reconfigurable and Programmable Filter for Software Defined Radio Based on a Transconductor-Capacitor Analog Array

This paper presents a reconfigurable and programmable analog array intended to support the implementation of the filter stage in a Software Defined Radio (SDR) wireless transceiver. The analog array is designed using the transconductor-capacitor (Gm-C) technique and may implement a wide variety of analog filters of programmable order and transfer function. The filtering stage implemented by the analog array is envisioned as part of a combined low-IF/zero-IF receiver architecture for an SDR transceiver. A modular method of synthesizing various order state-variable filters is used as tool for demonstrating the capabilities of the analog array. Different filters have been modeled, in both the complex and real domains, to demonstrate the capability of the analog array.