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Power performance and scalability of AlGaN/GaN power MODFETs

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5 Author(s)
Alekseev, E. ; Solid State Electron. Lab., Michigan Univ., Ann Arbor, MI, USA ; Pavlidis, D. ; Nguyen, N.X. ; Chanh Nguyen
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The scalability of power performance of AlGaN/GaN MODFETs with large gate periphery, as necessary for microwave power devices, is addressed in this paper. High-frequency large-signal characteristics of AlGaN/GaN MODFETs measured at 8 GHz are reported for devices with gatewidths from 200 μm to 1 mm. 1-dB gain compression occurred at input power levels varying from -1 to +10 dBm as the gatewidth increased, while gain remained almost constant at -17 dB. Output power density was ~1 W/mm for all devices and maximum output power (29.9 dBm) occurred in devices with 1-mm gates, while power-added efficiency remained almost constant at ~30%. The large-signal characteristics were compared with those obtained by dc and small-signal S-parameters measurements. The results illustrate a notable scalability of AlGaN/GaN MODFET power characteristics and demonstrate their excellent potential for power applications

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:48 ,  Issue: 10 )

Date of Publication:

Oct 2000

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