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Active and Passive Electronic Components
Volume 2009, Article ID 835789, 5 pages
Research Article

Electronically Tunable Dual-Input Integrator Employing a Single CDBA and a Multiplier: Voltage Controlled Quadrature Oscillator Design

1Department of Electronics & Telecommunication Engineering, Jadavpur University, Kolkata-700032, India
2Department of Electronics & Communication Engineering, Heritage Institute of Technology, Kolkata-700107, India
3Department of Electronics & Communication Engineering, B.P. Poddar Institute of Management & Technology, Kolkata-700052, India

Received 23 July 2009; Revised 1 December 2009; Accepted 3 December 2009

Academic Editor: Rezaul Hasan

Copyright © 2009 R. Nandi 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.


A new dual-input differential input active integrator using a current differencing buffered amplifier (CDBA) is proposed. A multiplier element is appropriately used in the circuit whose control voltage () tunes the integrator time constant () electronically. The design of a voltage controlled quadrature oscillator (VCQO) based on the proposed integrator had been satisfactorily implemented. A new type of measurement for the tuning error of the oscillator based on the Nyquist plot is presented that shows an error of only 2% at 1?MHz with Total Harmonic Distortion (THD) less than 3%.