GaN Digital Outphasing PA

This paper presents a novel GaN-based digital outphasing power amplifier for 800 MHz. The PA reaches a maximum output power of 5.8 W at 30 V final-stage drain supply voltage. A novel output combiner circuit is used and efficiency is improved by resonant commutation of the final-stages and optimized driver circuits for the two GaN push-pull final-stages. Power added efficiencies (PAE) of 59% and 25% at 0 dB and 10 dB power back-off (PBO), respectively, are achieved.