Fig. 3: Oscillator and its calibration design circuit.
a Schematic diagram of the oscillators based on VO2 device. b The effect of different applied current on oscillation frequency. c The effect of the different parallel capacitor on oscillation frequency. d–g The oscillatory response under different applied current and parallel capacitor. h The effect of applied current (Iin) on oscillation frequency of different oscillators. Variation from oscillator to oscillator is easily observed. i Schematic diagram of the circuit structure of calibratable oscillator. j The effect of the calibratable resistance Rc on oscillation frequency. k The effect of different applied current on oscillation frequency when using different Rc. l Oscillation frequency versus applied current for different oscillators with calibrated resistance Rc. It is clear that the variation between oscillators is effectively reduced compared to (h).
