1. Department of Microelectronics and Solid-State Electronics, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
2. Department of Microelectronics and Solid-State Electronics, School of Microelectronics, Tianjin University, Tianjin 300072, China
3. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
4. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China