Time flies, PhD life has been tough to start and to end. A lot of memories pop into my head as I am writing my dissertation. Those memories with happiness or toughness will all become a precious treasure and guide me for the future working and living. I would like to express my sincere thanks to all the professors, technician staff, group members, friends and family for their advice and encouragements towards the completion of doctoral study. First of all, I would like to extend my sincere gratitude my Ph.D supervisor Assoc. Prof Siek Liter, Assoc. Prof Boon Chirn Chye, and Assoc. Prof Yusuf Ali. They have provided great advice and guides to help me overcome difficulties during my research. Prof Boon has provided me lot of help to let me have chances to tape out and test.Besides, I would like to thank my team members, especially Guo Ting, Yang