1. School of Integrated Circuits and School of Electronic Science and Engineering, Nanjing University, Qixia, Nanjing, Jiangsu, China
2. Institute of Neuroinformatics, University of Zurich and ETH Zurich, Zurich, Switzerland
3. Electronic Circuits and Architectures (ELCA) Group, Faculty of Electrical Engineering, Mathematics, and Computer Science (EEMCS), Delft University of Technology, Delft, The Netherlands