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In0.5(AlxGa1-x)0.5 HEMTs for high-efficiency low-voltage power amplifiers: design, fabrication, and device results

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10 Author(s)
Yu-Chi Wang ; Lucent Technol., AT&T Bell Labs., Murray Hill, NJ, USA ; Jenn-Ming Kuo ; Fan Ren ; J. R. Lothian
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In0.5(AlxGa1-x)0.5 high electron-mobility transistors (HEMTs) are expected to have higher two-dimensional electron gas density and larger current drive capability than both Al0.23Ga0.77As and In0.5Ga 0.5P HEMTs due to the improved conduction-band offsets. In this paper, we performed a systematic investigation of the electrical properties of In0.5(AlxGa1-x)0.5 P (0⩽x⩽1) material system lattice matched to GaAs. By considering the conduction-band offset, direct-to-indirect-band electron transfer, donor-related deep levels, and Schottky barrier height, a relatively narrow range of the Al content 0.2⩽x⩽0.3 was found to be the optimum for the design of In0.5(AlxGa1-x)0.5 HEMTs. Under 1.2-V operation, power transistors with the optimum aluminum composition show high drain current density, high transconductance, and excellent power-added efficiency (65.2% at 850 MHz). These results demonstrate that InAlGaP HEMTs are promising candidates for high-efficiency low-voltage power applications

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:47 ,  Issue: 8 )