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Active and Passive Electronic Components
Volume 2009, Article ID 789171, 5 pages
Research Article

Current-Mode Third-Order Quadrature Oscillator Using CDTAs

Department of Electronic Engineering, Chung Yuan Christian University, Chung-Li 32023, Taiwan

Received 27 May 2009; Revised 18 August 2009; Accepted 8 September 2009

Academic Editor: Yalin Lu

Copyright © 2009 Jiun-Wei Horng. 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 a current-mode third-order quadrature oscillator based on current differencing transconductance amplifiers (CDTAs). Outputs of two current-mode sinusoids with phase difference are available in the quadrature oscillator circuit. The oscillation condition and oscillation frequency are orthogonal controllable. The proposed circuit employs only grounded capacitors and is ideal for integration. Simulation results are included to confirm the theoretical analysis.