1. National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Department of Micro/Nano Electronics, Shanghai Jiao Tong University, Shanghai 200240, China
2. State Key Laboratory of ASIC and System, School of Microelectronics, Shanghai Institute of Intelligent Electronics and Systems, Fudan University, Shanghai 200433, China
3. School of Integrated Circuits, Peking University, Beijing 100871, China