Ming-Der Shieh, Ming-Hwa Sheu, Chung-Ho Chen* and Hsin-Fu Lo
Department of Electronic Engineering
National Yunlin University of Science and Technology
Yunlin, Tiawan 640, R.O.C.
E-mail: shiehm@cad.el.yunteh.edu.tw
*Department of Electrical Engineering
National Cheng-Kung University
Tainan, Taiwan 701, R.O.C.