A new output structure for class E power amplifier (PA) is proposed in this paper. A series LC resonator circuit, tuned near the second harmonic of the operating frequency is added to the output circuit. This resonator causes low impedance at the second harmonic. The output circuit is designed to shape the switch voltage of the class E amplifier and lower the voltage stress of the transistor. T...

Nano-and microelectromechanical systems : fundamentals of nano-and microengineering / Sergey Edward Lyshevski. p. cm.-(Nano-and microscience, engineering, technology, and medicine series) Includes index. Includes bibliographical references and index. ISBN 0-8493-916-6 (alk. paper) 1. Microelectromechanical systems. 1. Title. II. Series. TK7875 .L96 2000 621.381—dc201 00-057953 CIP This book con...

in this research, the structural behavior of timber and concrete sleepers in a standard railway turnout is evaluated, in the case of raising speed. in approaching this evaluation, current practices in the structural analysis of sleepers are surveyed and then, the sensitivity analysis with abaqus software is made based on selected criteria (bending and shear stresses as well as contact pressure)...