1. School of Optoelectronic Engineering, Xi’an Technological University, Xi’an 710032, China
2. School of Microelectronics, Xidian University, Xi’an 710126, China
3. China Key System & Integrated Circuit Co., Ltd., Wuxi 214100, China
4. School of Biomedical Engineering and Technology, Tianjin Medical University, Tianjin 300071, China