A High-Power Low-Distortion GaAs HBT Power Amplifier for Mobile Terminals Used in Broadband Wireless Applications. - Tohru Oka; Masatomo Hasegawa; Michitoshi Hirata; Yoshihisa Amano; Yoshiteru Ishimaru; Hiroshi Kawamura; Keiichi Sakuno (IEEE J. Solid State Circuits, 2007)