Abstract :
Published by the ELECTRON DEVICES SOCIETY of the INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC. (c)2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.