1. State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau, China
2. School of Automation, China University of Geosciences, Wuhan, China
3. Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong
4. Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving, Hefei University of Technology, Hefei, China