Soon-Jyh Chang, Chung-Len Lee and Jwu E Chen*
Department of Electronic Engineering
and Institute of Electronics
National Chiao Tung University
Hsinchu, 300 Taiwan
E-mail: soon@dragon.ee.nctu.edu.tw
E-mail: cllee@cc.nctu.edu.tw
*Department of Electrical Engineering
Chung-Hua University
Hsinchu, 300 Taiwan
E-mail: jechen@chu.edu.tw