1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China
2. State Key Laboratory of Analog and Mixed-Signal VLSI, DECE, Faculty of Science and Technology (FST), Institute of Microelectronics, University of Macau, Macau, China
3. State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, and FST-DECE, University of Macau, Macau, China