1. National Key Laboratory of Advanced Micro and Nano Manufacture Technology, School of Integrated Circuits, Peking University, Beijing 100871, P. R. China
2. School of Software and Microelectronics, Peking University, Beijing 100871, P. R. China
3. School of Instrument Science and Opto-Electronics Engineering, Beijing Information Science and Technology University, Beijing 100096, P. R. China
4. School of Automation, University of Science and Technology Beijing, Beijing 100083, P. R. China
5. State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, P. R. China
6. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
7. Beijing Advanced Innovation Center for Integrated Circuits, Beijing 100871, P. R. China
8. Frontiers Science Center for Nano-optoelectronics, Peking University, Beijing 100871, P. R. China