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A 5-Watt Ka-band amplifier has been demonstrated. The area of the grid amplifier is 1 cm/sup 2/ and there are 512 transistors. The small-signal gain of the grid is 8 dB at 37.2 GHz, with 1.3 GHz bandwidth. At 5 Watts output, the gain is 5 dB with 15% power-added efficiency. An aluminum-nitride heat spreader allows continuous operation with an estimated gate temperature of 70/spl deg/C.