Andrew Lewis Fitch

Controlling Chaos in a Memristor Based Circuit Using a Twin-T Notch Filter

After the successful solid state implementation of memristors, a lot of attention has been drawn to the study of memristor based chaotic circuits. In this paper, a systematic study of chaotic behavior in such system is performed with the help of nonlinear tools such as bifurcation diagrams, power spectrum analysis, and Lyapunov exponents. In particular, a Twin-T notch filter feedback controller is designed and employed to control the chaotic behavior in the memristor based chaotic circuit. Both simulation and experiment results validate the proposed control method.

Hyperchaos in a memristor-based modified canonical Chua's circuit

After the successful solid state implementation of the memristor, memristor-based circuits have received a lot of attention. In this paper, a memristor with cubic nonlinear characteristics is employed in the modified canonical Chuas circuit. A systematic study of hyperchaotic behavior in this circuit is performed with the help of nonlinear tools such as Lyapunov exponents, phase portraits and bifurcation diagrams. In particular, an imitative memristor circuit is examined to reveal the construction of hyperchaotic attractors.

A Floating Memristor Emulator Based Relaxation Oscillator

In this paper, a flux-controlled memristor emulator with floating terminals by making use of four current conveyors is newly proposed. By replacing the three resistors in the positive and negative feedback loops of a typical relaxation oscillator respectively, three cases of memristor emulator based oscillating circuits are theoretically constructed and mathematically analyzed. To further probe the practicability and inherent features of the new memristor emulator and oscillator, experimental tests are carried out and the measured experimental results show differences from typical relaxation oscillators, this new memristor emulator based oscillator can provide novel and steady oscillating behaviors. The comparison of measured data with theoretical analysis is in good agreement, which further confirms the practicability of this new memristor emulator and oscillator.

Implementation of an analogue model of a memristor based on a light-dependent resistor

In this paper, an analogue model of a memristor using a light-dependent resistor (LDR) is presented. This model can be simplified into two parts: a control circuit and a variable resistor. It can be used to easily verify theoretical presumptions about the switching properties of memristors. This LDR-based memristor model can also be used in both simulations and experiments for future research into memristor applications. The paper includes mathematical models, simulations, and experimental results.

Realization of an analog model of memristor based on light dependent resistor

In this paper, a memristor analog model based on a light dependent resistor (LDR) is presented. This model can be simplified into two parts: a control circuit and a variable resistor. It can be used to easily verify theoretical presumptions about the properties of memristors. This LDR based memristor model can also be used in both simulations and experiments for future research into memristor applications. Mathematical models that describe the behaviors are derived. Multisim simulations and experimental results are given as well.

Chaos in a memcapacitor based circuit

The memcapacitor has the potential to be the most useful new component of recent years due to its functional and dynamic similarities to the memristor but with much lower power requirements. Although research interest is growing, there are very few memcapacitor based circuits. Here a memcapacitor based chaotic circuit is described with a novel method to emulate a charge controlled memcapacitor.

Development of Memristor Based Circuits

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Chaos in a Twin-T Circuit

This letter examines a driven nonlinear circuit that generates chaotic signals. The circuit is very simple, requiring just one op-amp stage. Only off-the-shelf components are required to construct the circuit. The circuit must be driven by a low frequency input-signal. The shape and frequency of the signal affect the behavior of the chaotic waveforms. A variety of unusually folded attractors have been observed from the computer simulation and practical circuit.

Chaos control in a memristor based circuit

After the successful solid state implementation of memristors, a lot of attention has been drawn to the study of memristor based chaotic circuits. In this paper, a Twin-T notch filter feedback controller is designed and employed to control the chaotic behavior in a memristor based chaotic circuit. Both simulation and experiment results validate the proposed control method.

An Analog Computer for Electronic Engineering Education

This paper describes a compact analog computer and proposes its use in electronic engineering teaching laboratories to develop student understanding of applications in analog electronics, electronic components, engineering mathematics, control engineering, safe laboratory and workshop practices, circuit construction, testing, and maintenance. The device develops student understanding through experiential learning, where theory is applied and process is observed. The device can be built by or issued to first-year students and used in a variety of units throughout an Electronic Engineering degree course. A number of applications are described that can be given as student laboratories and projects.