*Jia-Zhen Li1,2, Jhih-yuan Jhu1,2, Hoang-Tuan Vu2, Chih-Chiang Yang2, Yan-Kuin Su1,2
(1. Department of Electrical Engineering, Institute of Microelectronics, National Cheng Kung University, 2. Green Energy Technology Research Center, Department of Electrical Engineering, Kun Shan University, Tainan 710, Taiwan)