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Active and Passive Electronic Components
Volume 2014, Article ID 769198, 14 pages
http://dx.doi.org/10.1155/2014/769198
Research Article

Reconfigurable Mixed Mode Universal Filter

Department of Electronics and Communication Engineering, Jamia Millia Islamia University, New Delhi 110025, India

Received 26 June 2014; Revised 13 September 2014; Accepted 19 September 2014; Published 20 October 2014

Academic Editor: Sudhanshu Maheshwari

Copyright © 2014 Neelofer Afzal and Devesh Singh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents a novel mixed mode universal filter configuration capable of working in voltage and transimpedance mode. The proposed single filter configuration can be reconfigured digitally to realize all the five second order filter functions (types) at single output port. Other salient features of proposed configuration include independently programmable filter parameters, full cascadability, and low sensitivity figure. However, all these features are provided at the cost of quite large number of active elements. It needs three digitally programmable current feedback amplifiers and three digitally programmable current conveyors. Use of six active elements is justified by introducing three additional reduced hardware mixed mode universal filter configurations and its comparison with reported filters.