[He, Hongyu] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.^[He, Hongyu;Lin, Xinnan;Zhang, Shengdong] Peking Univ, Shenzhen Grad Sch, Sch Elect & Comp Engn, Shenzhen 518005, Peoples R China.^[Liu, Yuan] China Elect Prod Reliabil & Environm Testing Res, Sci & Technol Reliabil Phys & Applicat Elect Comp, Guangzhou 510610, Guangdong, Peoples R China.^[Wang, Hao] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China.^[Zheng, Xueren] South China Univ Technol, Sch Elect & Informat Engn, Guangzhou 510640, Guangdong, Peoples R China.