1. School of Microelectronics Tianjin University Tianjin P. R. China
2. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin P. R. China
3. Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology Tianjin University Tianjin P. R. China
4. National Key Laboratory of ASIC Hebei Semiconductor Research Institute Shijiazhuang P. R. China
5. School of Electronic and Information Engineering Hebei University of Technology Tianjin P. R. China