Weifeng Feng received the B.S. degree from Tsinghua University, Beijing, China, in 1999, the M.S. degree from California Polytechnic State University, San Luis Obispo, CA, USA, in 2001, and the Ph.D. degree in electrical engineering from the University of California, Irvine, CA, USA, in 2010. He is currently with Wuxi Grand Microelectronics, China. His research interests include CMOS RF integrated circuits, high performance PLLs, and systems including PAs for mobile communication.