Modeling and the analysis of control logic for a digital PWM controller based on a nano electronic single electron transistor

This paper describes the modelling and the analysis of control logic for a Nano-Device- based PWM controller. A comprehensive simple SPICE schematic model for Single Electron transistor has been proposed. The operation of basic Single Electron Transistor logic gates and SET flip flops were successfully designed and their performances analyzed. The proposed design for realizing the logic gates and flip-flops is used in constructing the PWM controller utilized for switching the buck converter circuit. The output of the converter circuit is compared with reference voltage, and when the error voltage and the reference are matched the latch is reset so as to generate the PWM signal. Due to the simplicity and accuracy of the compact model, the simulation time and speed are much faster, which makes it potentially applicable in large-scale circuit simulation. This study confirms that the SET-based PWM controller is small in size, consumes ultra low power and operates at high speeds without compromising any performance. In addition these devices are capable of measuring charges of extremely high sensitivity

On the Usage of Harmonic Balance to Simulate Memristive Devices and Circuits

This paper proposes the usage harmonic balance method to find the steady state solution on memristive devices and circuits. Harmonic balance is a well-established simulation tool often used to find the periodic steady state solution of circuits involving non-linear elements. It is a particularly efficient method when the focus is on the characterization of the frequency-domain behavior of some quantity in the circuit. This important characteristic arises due to the nature of the mathematical procedures involved, which operate directly on the frequency domain. One such example, is the problem of simulating the frequency behavior of the hysteresis loop area of a memristive device. In this paper, we describe the preliminary analysis involved in harmonic balance simulation and how it applies to the characterization of a memristive device. Simulation results at the end of the paper disclose important considerations on the accuracy of the method and its efficiency when compared to standard time domain methods