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In this paper the design and the measurement of a 2 GHz 50 Watt (CW) MMIC power amplifier (PA) are discussed. The authors believe that this is the most powerful MMIC implementation that has been reported. The amplifier utilizes a class-F combining structure and realized using the company internal 0.5 μm GaAs pHEMT power process. The MMIC measure 10×10 mm2 and delivers 50 Watts of CW power at an efficiency greater than 45% over more than 10% bandwidth at a nominal 12 V supply voltage. The amplifier gain is 21 dB throughout the operational band.