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Active and Passive Electronic Components
Volume 2009, Article ID 595324, 4 pages
Letter to the Editor

Comment on “Voltage-Mode All-Pass Filters Including Minimum Component Count Circuits”

Division of Electronics and Communication Engineering, Netaji Subhas Institute of Technology (NSIT), Sector-3, Dwarka, New Delhi 110075, India

Received 17 January 2009; Accepted 8 February 2009

Copyright © 2009 Abhirup Lahiri. 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 comment is related to the recently published article “Active and Passive Electronic Components” by S. Maheshwari (2007), which presents single current differencing buffered amplifier (CDBA) and current-controlled current differencing buffered amplifier- (CC-CDBA-) based first-order voltage-mode (VM) all-pass filtering (APF) sections. The paper is reviewed, and additional first-order APF realizations have been proposed.