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A Novel High Voltage, Vertical MOSFET for High Power RF Applications

This paper describes a novel, high-voltage vertical FET (HWFET) for high power RF applications. The silicon MOSFET provides improved power density, RF gain, and ruggedness over competing device technologies. A unique flip-chip packaging strategy also provides thermal and reliability advantages. Both a 25 Watt and a 100 Watt embodiment of the structure exhibit over 20 dB of gain with >45% efficiency from 1.2 to 1.4 GHz in a package that is approximately 1/4 the size of competing device technologies. A 300 Watt version of the device exhibits >15.5 dB of gain with > 46% efficiency from 1.03 to 1.09 GHz.