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In the present paper, we report on the switching dynamics of both single andcoupled VO2-based oscillators, with resistive and capacitive coupling, andexplore the capability of their application in oscillatory neural networks.Based on these results, we further select an adequate SPICE model to describethe modes of operation of coupled oscillator circuits. Physical mechanismsinfluencing the time of forward and reverse electrical switching, thatdetermine the applicability limits of the proposed model, are identified. Forthe resistive coupling, it is shown that synchronization takes place at acertain value of the coupling resistance, though it is unstable and asynchronization failure occurs periodically. For the capacitive coupling, twosynchronization modes, with weak and strong coupling, are found. The transitionbetween these modes is accompanied by chaotic oscillations. A decrease in thewidth of the spectrum harmonics in the weak-coupling mode, and its increase inthe strong-coupling one, is detected. The dependences of frequencies and phasedifferences of the coupled oscillatory circuits on the coupling capacitance arefound. Examples of operation of coupled VO2 oscillators as a central patterngenerator are demonstrated.

Switching dynamics of single and coupled VO2-based oscillators as elements of neural networks