A 2.9-GHz LC-VCO based PLL with a fast automatic frequency control. - Hui Dong Lee; Nam-Sik Ryu; Jae Ho Jung; Kwang Chun Lee (ISWCS, 2012)

CMOS Doherty Amplifier With Variable Balun Transformer and Adaptive Bias Control for Wireless LAN Application. - Nam-Sik Ryu; Seung Hyun Jang; Kwang Chun Lee; Yongchae Jeong (IEEE J. Solid State Circuits, 2014)