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Active and Passive Electronic Components
Volume 2007, Article ID 79159, 5 pages
Research Article

Voltage-Mode All-Pass Filters Including Minimum Component Count Circuits

Department of Electronics Engineering, Z. H. College of Engineering and Technology, Aligarh Muslim University, Aligarh 202 002, India

Received 13 September 2006; Revised 16 November 2006; Accepted 21 November 2006

Academic Editor: Brock J. La Meres

Copyright © 2007 Sudhanshu Maheshwari. 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.


This paper presents two new first-order voltage-mode all-pass filters using a single-current differencing buffered amplifier and four passive components. Each circuit is compatible to a current-controlled current differencing buffered amplifier with only two passive elements, thus resulting in two more circuits, which employ a capacitor, a resistor, and an active element, thus using a minimum of active and passive component counts. The proposed circuits possess low output impedance, and hence can be easily cascaded for voltage-mode systems. PSPICE simulation results are given to confirm the theory.