Third-Order Quadrature Sinusoidal Oscillators Employing OTRAs with Independent Control of Oscillation Condition and Frequency of Oscillation

This communication presents two new voltage mode (VM) third-order quadrature sinusoidal oscillator (TOQSO) configurations employing three operational transresistance amplifiers (OTRAs), six resistors and three virtually grounded capacitors. The proposed circuits have independent control of condition of oscillation (CO) and frequency of oscillation (FO) utilizing the intrinsic current differencing property of the OTRA. The proposed TOQSOs have ideally zero output impedance, a feature suitable for easy cascadability. Nonideal and sensitivity analyses have been carried out and compared with those obtained from ideal analysis. The presented TOQSOs have been simulated using OTRAs implemented with macro model of off-the-shelf available AD844 ICs. Experimental results have also been included using OTRAs realized with commercially available AD844 CFOA ICs.