1. University of Michigan−Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
2. Semiconductor Research Center, Foxconn Research, Taiwan 114699, China
3. Department of Electrical Engineering, National Central University, Taiwan 320317, China
4. State Key Laboratory of Radio Frequency Heterogeneous Integration, Shanghai Jiao Tong University, Shanghai 200240, China