Quadrature oscillator using operational transresistance amplifier

Quadrature oscillator based on the operational transresistance amplifier (OTRA) is presented in this paper. The proposed quadrature oscillator circuit uses two OTRAs as main active building blocks and a few external passive components to generate the oscillations. The circuit provides independent control over the condition of oscillation and frequency of oscillation. A prototype circuit is implemented on a laboratory breadboard using commercially available current feedback operational amplifier ICs (AD844 AN) and passive components are connected externally and tested for waveform generation. Both the SPICE simulation and experimental results are given to verify the theoretical analysis.