Nonlinear Phenomena and Deterministic Chaos in Systems With Vanadium Dioxide

Velichko, Andrei; Pergament, A. L.; Stefanovitch, G. B.; Борисков, П. П.

doi:10.15393/j8.art.2014.3044

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…quasi-periodic oscillations has been described in our previous work. 37 This regime is also described by the proposed model, and the simulated and experimental spectra of quasiperiodic oscillations agree qualitatively.…”

Section: Single-oscillator Circuit Based On Vo2 Switchsupporting

confidence: 56%

“…The broadening of the oscillation peaks is much greater than that for a single oscillator, which is likely due to the prolonged staying of the operating point near the reverse transition voltage (Vh), where there is a significant increase in current noise. 37 On the other hand, if we use the slew rate terminology, at the OFF moment, we see abnormally low values of this rate (∂V/∂t ~25 V/s, Fig. 21b), which just causes a broadening of the spectra.…”

Section: Discussionmentioning

confidence: 93%

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

Velichko

Belyaev

Putrolaynen

et al. 2017

Int. J. Mod. Phys. B

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In the present paper, we report on the switching dynamics of both single and coupled VO2-based oscillators, with resistive and capacitive coupling, and explore the capability of their application in oscillatory neural networks. Based on these results, we further select an adequate SPICE model to describe the modes of operation of coupled oscillator circuits. Physical mechanisms influencing the time of forward and reverse electrical switching, that determine the applicability limits of the proposed model, are identified. For the resistive coupling, it is shown that synchronization takes place at a certain value of the coupling resistance, though it is unstable and a synchronization failure occurs periodically. For the capacitive coupling, two synchronization modes, with weak and strong coupling, are found. The transition between these modes is accompanied by chaotic oscillations. A decrease in the width of the spectrum harmonics in the weak-coupling mode, and its increase in the strongcoupling one, is detected. The dependences of frequencies and phase differences of the coupled oscillatory circuits on the coupling capacitance are found. Examples of operation of coupled VO2 oscillators as a central pattern generator are demonstrated.

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Section: Single-oscillator Circuit Based On Vo2 Switchsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 93%

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

Velichko

Belyaev

Putrolaynen

et al. 2017

Int. J. Mod. Phys. B

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Structural and electrical characterization of polycrystalline NbO2 thin film vertical devices grown on TiN-coated SiO2/Si substrates

Joshi

Borisov

Lederman

2018

Journal of Applied Physics

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We report on the electrical properties of polycrystalline NbO2 thin film vertical devices grown on TiN coated SiO2/Si substrates using pulsed laser deposition. First, we analyzed the thickness and contact size dependences of threshold switching of NbO2 films grown in 10 mTorr Ar/O2 mixed growth pressure, where 25.1%/74.9% of NbO2/Nb2O5 surface composition content was estimated by ex-situ x-ray photoelectron spectroscopy. The leakage current properties in the insulating state were dominated by trap-charge assisted Poole-Frankel conduction mechanism. The threshold switching and self-sustained current oscillatory behavior of films with different NbO2/Nb2O5 composition ratios was measured and analyzed. The second film was grown in lower (1 mTorr) growth pressure which resulted in a higher (34.2%/65.8%) NbO2/Nb2O5 film surface composition. The film grown in higher growth pressure demonstrated lower offstate leakage current, faster switching and self-sustained oscillations with higher frequency than the film grown in lower growth pressure.

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Nonlinear Phenomena and Deterministic Chaos in Systems With Vanadium Dioxide

Cited by 2 publications

References 18 publications

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

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

Structural and electrical characterization of polycrystalline NbO2 thin film vertical devices grown on TiN-coated SiO2/Si substrates

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Nonlinear Phenomena and Deterministic Chaos in Systems With Vanadium Dioxide

Cited by 2 publications

References 18 publications

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

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

Structural and electrical characterization of polycrystalline NbO2 thin film vertical devices grown on TiN-coated SiO2/Si substrates

Contact Info

Product

Resources

About

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

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