1. Sirindhorn International Institute of Technology (SIIT), Thammasat University, Pathum Thani 12120, Thailand
2. Department of Electronics Engineering, National Chiao-Tung University, Rm. 107, Engineering
Building D, Kuang-Fu Campus, No. 1001, University Road, Hsinchu, Taiwan
3. Taiwan Semiconductor Research Institute, Hsinchu, Taiwan