We present an experimental approach to study the ultrafast polarization switching dynamics in thin-film ferroelectrics. A semiconductor photoconductive switch with femtosecond laser illumination is used as a ‘‘pulse generator’’ to produce jitter-free, sub-100 ps rise time step-function-like electrical pulses. Quantitative measurements yield a polarization switching time, ts , of ;220 ps when me...

This paper proposed the comparison made between Multi-Carrier Pulse Width Modulation, Sinusoidal Pulse Width Modulation and Selective Harmonic Elimination Pulse Width Modulation technique for minimization of Total Harmonic Distortion in Cascaded H-Bridge Multi-Level Inverter. In Multicarrier Pulse Width Modulation method by using Alternate Position of Disposition scheme for switching pulse gene...

The design of a pneumatic pulse-width modulated pressure control via trajectory optimized fast-switching electromagnetic valves is presented. Two fast-switching valves are used in a half bridge configuration for pressure control in a pneumatic volume. The valves are operated using a feedforward control, which guarantees soft landing and time optimality. The control performance and achievable no...

In this paper a two-phase supply modulator suitable for envelope tracking power amplifier is presented. The designed supply modulator has the linear assisted switching architecture. Two-phase architecture is used in order to reduce the output switching ripples. The proposed architecture uses hysteretic control instead of pulse width modulation (PWM) which significantly reduces the circuit compl...

The multilevel inverter topology gives the advantages of usage in high power and high voltage application with reduced harmonic distortion without a transformer. This paper presents a comparative study of nine level diode clamped inverter for constant Switching frequency of sinusoidal Pulse width Modulation and sinusoidal Natural Pulse width Modulation with switching frequency Optimal Modulation.

Reduced switching loss favours Pulse Skipping Modulation mode of switching dc-to-dc converters at light loads. Under certain conditions the converter operates in discontinuous conduction mode (DCM). Inductor current starts from zero in each switching cycle as the switching frequency is constant and not adequately high. A DC-to-DC buck converter is modelled and simulated in this paper under DCM....

Random optical-pulse polarization switching along an active optical medium in the Λ configuration with spatially disordered occupation numbers of its lower energy sublevel pair is described using the idealized integrable Maxwell-Bloch model. Analytical results describing the light polarization-switching statistics for the single self-induced transparency pulse are compared with statistics obtai...

A new approach to speed up the addressing of Surface Stabilized Ferroelectric Liquid Crystal (SSFLC) displays by selecting two rows at a time is proposed. It combines the ideas from fast addressing modes of SSFLC with multiline selection of root-mean-square responding devices. The technique has been verified experimentally. switching process has the decisive role. The writing pulse is preceded ...

We report on a cross-gain and cross-phase modulation experiment in an InGaAsP semiconductor optical ampliier. For 150 fs pulses we observe large pulse broadening and pulse break-up resulting in performance limitations for ultrafast switching devices. Introduction: Semiconductor optical ampliiers (SOA's) are key components in high-speed optical communication networks in functions as optical swit...