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In order to meet the demand for mass production of 77 GHzautomotive radar systems, a low cost and high performance 38/77 GHzAlGaAs/InGaAs PHEMT MMIC transmit amplifier with a multiplier hasbeen realized. The chip is packaged in an inexpensive conventionalnon-hermetic package. Excellent power performance is demonstrated with a15 dBm output power and 7 dB maximum conversion gain from 38 to 76.5GHz. Also, highly reliable RF operation of a bare MMIC chip is obtainedwith less than 0.7 dB reduction in output power during 10[superscript 6] hr at V[subscript d]=4 V and T[subscript a]=25[degrees]C in air

Simultaneous achievement of high performance and high reliability in a 38/77GHz InGaAs/AlGaAs PHEMT MMIC