Title :
RF performance and thermal analysis of AlGaN/GaN power HEMTs in presence of self-heating effects
Author :
Nuttinck, S. ; Gebara, E. ; Laskar, J. ; Wagner, B. ; Harris, M.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
Power, linearity and noise performance of AlGaN/GaN power HEMTs are measured at different gate-to-source bias conditions in order to study the influence of self-heating on RF performance. Additionally, a load-pull system, capable of measuring intermodulation distortion products under pulsed mode of operation, is implemented for the first time. This new system is used to investigate the impact of self-heating on power device linearity. Also, for the first time, the effect of the RF drive on thermal effects and power added efficiency (PAE) is investigated. This forms the basis of more accurate nonlinear models. Finally, thermal simulations of 2-finger GaN FETs are performed under pulsed and continuous regimes to determine the temperature distribution caused by a 5W/mm power dissipation density.
Keywords :
III-V semiconductors; aluminium compounds; gallium compounds; intermodulation distortion; microwave field effect transistors; microwave power transistors; power HEMT; semiconductor device noise; temperature distribution; thermal analysis; 2-finger GaN FETs; AlGaN-GaN; AlGaN/GaN power HEMTs; RF drive; RF performance; gate-to-source bias conditions; intermodulation distortion products; linearity; load-pull system; noise performance; nonlinear models; power added efficiency; power dissipation density; pulsed mode; self-heating effects; temperature distribution; thermal analysis; thermal simulations; Aluminum gallium nitride; Distortion measurement; Gallium nitride; HEMTs; Linearity; MODFETs; Performance analysis; Power measurement; Pulse measurements; Radio frequency;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1011780
