Table of Contents
ISRN Electronics
Volume 2012, Article ID 890615, 7 pages
Research Article

Single OTRA Based Analog Multiplier and Its Applications

1Department of Electronics and Communication Engineering, Delhi Technological University, Delhi 110042, India
2Department of Electronics Engineering, Indian School of Mines, Dhanbad 826004, India

Received 30 August 2012; Accepted 2 October 2012

Academic Editors: H. A. Alzaher and E. Tlelo-Cuautle

Copyright © 2012 Rajeshwari Pandey 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.


This paper presents an analog multiplier using single operational transresistance amplifier (OTRA). The proposed circuit is suitable for integration as it does not use any external passive component. It can be used as a four-quadrant multiplier. Theoretical propositions are verified through PSPICE simulations using 0.5 μm CMOS parameters provided by MOSIS (AGILENT). The simulation results are in close agreement with theoretical predictions. The workability of the proposed multiplier is also tested through two applications, namely, a squarer and an amplitude modulator.