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Journal of Electrical and Computer Engineering
Volume 2011 (2011), Article ID 586853, 8 pages
Research Article

Operational Transresistance Amplifier-Based Multiphase Sinusoidal Oscillators

1Department of Electronics and Communication Engineering, Delhi Technological University, Delhi, 42, India
2Kritikal Solutions Pvt. Ltd., Embedded Division, Noida, UP, 201301, India
3Department of Electronics Engineering, Indian School of Mines, Dhanbad, 826004, India

Received 7 March 2011; Accepted 19 May 2011

Academic Editor: Raj Senani

Copyright © 2011 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.


Multiphase sinusoidal oscillator circuits are presented which utilize Operational Transresistance Amplifier (OTRA) as the active element. The first circuit produces n odd-phase oscillations of equal amplitudes and equally spaced in phase. The second circuit is capable of producing n odd- or even- phase oscillations equally spaced in phase. An alternative approach is discussed in the third circuit, which utilizes a single-phase tunable oscillator circuit which is used to inject signals into a phase shifter circuits. An automatic gain control (AGC) circuit has been implemented for the second and third circuit. The circuits are simple to realize and have a low component count. PSPICE simulations have been given to verify the theoretical analysis. The experimental outcome corroborates the theoretical propositions and simulated results.