A memristor-based Wien-bridge sinusoidal/chaotic oscillator

Abstract

This paper presents the experimental results obtained from a memristor-based Wienbridge oscillator implemented using a new memristor emulator. The memristor emulator can be implemented using off-the-shelf components. The experimental results show that nonlinear chaotic as well as linear oscillations can be obtained from the same circuit by careful adjustment of the value of a single resistor. The proposed circuit can be easily presented in an undergraduate laboratory course to demonstrate the use of memristors in generating chaotic oscillators.

Sawtooth Signal Generator Using a Carbon-Based Memristor

“…The simulated and experimental MBSSG waveforms are compared. It has been inferred that the MBSSG waveforms behave differently than the simulation results given in [29,30] using the system model with Biolek's window functions predicts. Also, the experiments have shown that a nice-looking sawtooth wave is obtained at frequencies as high as 400 kHz even though the waveform is tapered a bit.…”

“…Output voltage of the generator does not always resemble a sawtooth waveform. Due to the simulations given in [29,30], it was expected that it would look like a square waveform while the operation frequency increases. However, the experiments showed that if the frequency gets around 1 MHz, then, the output waveform turns into a smoothened sawtooth waveform as shown in Figure 6h and therefore the output cannot be called a sawtooth waveform anymore.…”

“…Memristor-based relaxation oscillators are examined in [10,[22][23][24]. Some of the memristor applications have focused on the Wien-bridge oscillators [25][26][27][28][29]. In [30], it is demonstrated that a memristor-based sawtooth signal generator (MBSSG) can be built.…”