4th International Conference on Circuits and Systems (CIRSY-2017) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications impacts and challenges of Circuits, Systems and Applications. The goal of this conference is to bring together researchers and practitioners from academia and industry to focus on circuits and systems, establishing new collaborations in these areas. Original research papers, state-of-the-art reviews are invited for publication in all areas of circuits and systems.