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The Scientific World Journal
Volume 2013, Article ID 201565, 8 pages
Research Article

Gm-Realization of Controlled-Gain Current Follower Transconductance Amplifier

Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand

Received 21 September 2013; Accepted 24 October 2013

Academic Editors: Y. Ding and W.-P. Shih

Copyright © 2013 Worapong Tangsrirat. 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 describes the conception of the current follower transconductance amplifier (CFTA) with electronically and linearly current tunable. The newly modified element is realized based on the use of transconductance cells () as core circuits. The advantage of this element is that the current transfer ratios ( and ) can be tuned electronically and linearly by adjusting external DC bias currents. The circuit is designed and analyzed in 0.35 μm TSMC CMOS technology. Simulation results for the circuit with ±1.25 V supply voltages show that it consumes only 0.43 mw quiescent power with 70 MHz bandwidth. As an application example, a current-mode KHN biquad filter is designed and simulated.