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The design and performance of 0.15-um PHEMT V-band driver and power amplifier MMICs suitable for satellite communication systems is presented. The amplifiers utilize a proven commercially available production released process featuring demonstrated low power slump characteristics and reliability suitable for space applications. Experimental results for the driver amplifier MMIC demonstrate greater than 17 dB of small signal gain, 25 dBm saturated output power and 29% power added efficiency at 60 GHz. The power amplifier MMIC provides 17 dB of small signal gain, up to 27.5 dBm saturated output power and 26% power added efficiency. A 1200-hour test at 5 dB gain compression resulted in less than 0.5 dB of output power drift.