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This paper describes the design and measurement of a medium power amplifier (MPA) using 0.15 μm GaAs PHEMT technology for wireless application. At 2.4 GHz and 3.0 V of VDS, a fabricated MPA exhibits a P1dB of 15.20 dBm, PAE of 12.70% and gain of 9.70 dB. The maximum current, Imax is 84.40 mA and the power consumption for this device is 253.20 mW. The die size of this amplifier is 1.2 mm × 0.7 mm.