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Active and Passive Electronic Components
Volume 2011, Article ID 313580, 10 pages
Research Article

A Generic Current Mode Design for Multifunction Grounded Capacitor Filters Employing Log-Domain Technique

Department of Electronics and Instrumentation Technology, University of Kashmir, Srinagar 190 006, India

Received 22 January 2011; Revised 7 March 2011; Accepted 18 April 2011

Academic Editor: Ichihiko Toyoda

Copyright © 2011 N. A. Shah and F. A. Khanday. 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.


A generic design (GD) for realizing an nth order log-domain multifunction filter (MFF), which can yield four possible stable filter configurations, each offering simultaneously lowpass (LP), highpass (HP), and bandpass (BP) frequency responses, is presented. The features of these filters are very simple, consisting of merely a few exponential transconductor cells and capacitors; all grounded elements, capable of absorbing the shunt parasitic capacitances, responses are electronically tuneable, and suitable for monolithic integration. Furthermore, being designed using log-domain technique, it offers all its advantages. As an example, 5th-order MFFs are designed in each case and their performances are evaluated through simulation. Lastly, a comparative study of the MFFs is also carried, which helps in selecting better high-order MFF for a given application.