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Synchronous Oscillations in Van der Pol Generator with Modulated Natural Frequency
Radiofizika i Radioastronomia, Vol. 20, #4, pp.340-347 (2015) (in Russian)

A.Yu. Nimets and D.M. Vavriv

The synchronous operation of Van Der Pole generator with the low-frequency modulated natural frequency has been investigated. The presence of low-frequency modulation is shown to lead to formation of additional synchronization regions. The appearance of such regions is found to be caused by three-frequency resonances resulted from the interaction between oscillations of the generator natural frequency, modulation frequency and synchronized signal frequency. Characteristics of synchronous oscillations due to the below mentioned three-frequency interaction are obtained and comparison with the case of synchronization of oscillator on the main mode made.