1. Department of Electrical Engineering, Institute of Microelectronics, National Cheng Kung University, Tainan, Taiwan
2. Department of Electronic Engineering, National United University, Miaoli City, Taiwan
3. Department of Electronic Engineering, National Formosa University, Yunlin City, Taiwan
4. Department of Electrical Engineering, Institute of Microelectronics, National Cheng Kung University, Tainan City, Taiwan