Zheng Sun was born in Yancheng, China, in 1993. He received the B.S. degree in information engineering from Southeast University，Nanjing, China, in 2014, and the M.S. degree in information, production, and systems engineering from Waseda University, Fukuoka, Japan, in 2015. He received the Ph.D. degree in physical electronics from the Tokyo Institute of Technology, Tokyo, Japan in 2021. He was involved in low-power transceivers for Internet of Things, mixed-signal circuits, and low-power digital PLL designs. His research interests include transceivers for Bluetooth Low Energy, Low-power/high-performance LC-VCO for ISM/5G applications, ultra-low-jitter PLLs for 5G cellular and harmonic suppression techniques for the power amplifier. From April 2021 until July 2021, He was a Post-Doctoral Researcher with the Tokyo Institute of Technology, Tokyo, Japan. He is now with Apple Inc., Tokyo, Japan, working on wireless connectivity.