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 the local chair and the co-chair of this conference.  IWECSÕ13 attracted 30 international leading researchers and company executives to share latest advances in the emerging circuits and systems.