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Active and Passive Electronic Components
Volume 2017 (2017), Article ID 5240751, 10 pages
https://doi.org/10.1155/2017/5240751
Research Article

Three-Input Single-Output Voltage-Mode Multifunction Filter with Electronic Controllability Based on Single Commercially Available IC

1Department of Electrical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand
2Department of Engineering Education, Faculty of Industrial Education, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand

Correspondence should be addressed to Winai Jaikla; moc.liamtoh@aj.ianiw

Received 6 January 2017; Accepted 6 February 2017; Published 3 April 2017

Academic Editor: Jiun-Wei Horng

Copyright © 2017 Supachai Klungtong et al. 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 second-order voltage-mode filter with three inputs and single-output voltage using single commercially available IC, one resistor, and two capacitors. The used commercially available IC, called LT1228, is manufactured by Linear Technology Corporation. The proposed filter is based on parallel RLC circuit. The filter provides five output filter responses, namely, band-pass (BP), band-reject (BR), low-pass (LP), high-pass (HP), and all-pass (AP) functions. The selection of each filter response can be done without the requirement of active and passive component matching condition. Furthermore, the natural frequency and quality factor are electronically controlled. Besides, the nonideal case is also investigated. The output voltage node exhibits low impedance. The experimental results can validate the theoretical analyses.