1. School of Microelectronics, Southern University of Science and Technology 1 , Shenzhen, China
2. School of Energy Science and Engineering, Harbin Institute of Technology 2 , Harbin 150001, China
3. State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University 3 , Shanghai 200433, China
4. Department of Electrical and Computer Engineering, National University of Singapore 4 , Singapore
5. Engineering Research Center of Integrated Circuits for Next-Generation Communications Ministry of Education, Southern University of Science and Technology 5 , Shenzhen, China
6. GaN Device Engineering Technology Research Center of Guangdong, Southern University of Science and Technology 6 , Shenzhen, China