Abstract
FEATURES OF OPERATION IN THE VAN DER POL TRANSISTOR OSCILLATOR
Yefim Berkovich* and Sagi Moshe
ABSTRACT
The Van der Pol Oscillator, which is a classic example of a selfoscillating device, is usually analyzed using the noted Van der Pol equation. The paper shows that being a good model for describing selfoscillations of a very different nature, this equation, however, does not accurately describe the processes in the device itself. It should be noted that Van der Pol equation was actually obtained for oscillators based on tube amplifiers, which were rather imperfect and obsolete technology and long ago replaced by transistor amplifiers. Accordingly, in this paper, a more accurate mathematical model of a transistorbased oscillator is studied, using the Matlab-Simscape program where the obtained results are compared with the conventional ones. The proposed model does not refute the Van der Pol equation, rather clarifies the processes that develops and yields a plausible new aspect of study on synchronizing self-oscillations, the processes of transferring active power and the impact of reactive power on the synchronization of oscillations. Using a physical model, the results of theoretical study were confirmed by experimental verification.
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