The 4th International Workshop on Emerging Circuits and Systems (IWECS13), was held successfully in The University of Electronic Science and Technology of China (UESTC), Chengdu, China from Aug. 25-26, 2013. Dr. Tan is the organizer and international chair of the IWECS13. UESTC hosted this event. Prof. Hai Wang, who the associate professor at SJTU, is...