Active and Passive Electronic Components
Volume 2009 (2009), Article ID 987304, 4 pages
doi:10.1155/2009/987304
Research Article
DDCC-Based Quadrature Oscillator with Grounded Capacitors and Resistors
Telecommunications Engineering Department, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Received 2 October 2008; Revised 24 November 2008; Accepted 19 January 2009
Academic Editor: Krishnamachar Prasad
Copyright © 2009 Montree Kumngern and Kobchai Dejhan. 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.
Abstract
A new voltage-mode quadrature oscillator using two differential difference current conveyors (DDCCs), two grounded capacitors, and three grounded resistors is presented. The proposed oscillator provides the following advantages: the oscillation condition and oscillation frequency are orthogonally controlled; the oscillation
frequency is controlled through a single grounded resistor; the use of only grounded capacitors and resistors makes the proposed circuit ideal for IC implementation; low passive and active sensitivities. Simulation results verifying the theoretical analysis are also included.