1. Exemplary School of Microelectronics, School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China
2. Chengdu Sino Microelectronics Technology Co., Ltd, Chengdu, China
3. Department of Precision Instrument, Tsinghua University, Beijing, China
4. Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy