[1] Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
[2] Department of Electronic Engineering, Cheng Shiu University, Niaosong, Kaohsiung 833, Taiwan
[3] United Microelectronics Corporation, Ltd., Tainan Science-Based Industrial Park, Tainan 74145, Taiwan