High Efficiency, High Linearity GaN HEMT Amplifiers for WiMAX Applications

GaN HEMT power transistors are a key enabling technology for the successful design of WiMAX, WiBro and next generation radio systems. This article describes the design and performance of a number of demonstration amplifiers using Cree GaN HEMTs, including a Doherty circuit providing the highest reported performance for a WiMAX power amplifier.