In this work, a current-mode class-S RF power amplifier demonstrator working around 1 GHz has been designed and implemented following a partitioning design approach. Based on this approach, the entire class-S system has been systematically divided into several sub-modules; each sub-module is then separately designed, fabricated, and characterized. The unique advantages of this specialized design technique for implementing such complicated RF PA circuits have been presented. To our best knowledge, modulated signal with 80 MHz modulation bandwidth has been for the first time applied to test a class-S PA in the GHz range. Finally, the operating principles of the current-mode class-S power amplifier have been proven by the designed demonstrator with GaN HEMTs and key design considerations have been pointed out.
[1]
S. C. Cripps,et al.
RF Power Amplifiers for Wireless Communications
,
1999
.
[2]
Rudiger Quay,et al.
900 MHz pulse-width-modulated class-s power amplifier with improved linearity
,
2011,
2011 IEEE MTT-S International Microwave Symposium.
[3]
Andreas Wentzel,et al.
RF class-S power amplifiers: State-of-the-art results and potential
,
2010,
2010 IEEE MTT-S International Microwave Symposium.
[4]
P. Asbeck,et al.
Digital generation of RF signals for wireless communications with band-pass delta-sigma modulation
,
2001,
2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).