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This paper reports our development of a monolithic InP HEMT based power amplifier showing state-of-the-art V-band performance. A single-stage amplifier with 600um cell periphery demonstrated 224 mW of output power at the peak power-added efficiency of 43% with 7.5 dB power gain at 60 GHz. To the best of our knowledge, this is the best combination of output power and efficiency reported to date at this frequency for a solid . state amplifier.

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