Abstract: In this paper the design of a multifunction MMIC for millimeter wave mobile communication systems is presented. The MMIC is a single balanced mixer that can work as both up and down converter between C and V band and as a BPSK modulator. A step by step design technique is described, based on harmonic balance simulations. The mixer devices are Schottky diodes, and all the components are integrated in a MMIC chip using GaAs MESFET technology. The mixers were optimized to have a similar performance as both up or down converter, between C and V bands and a bandwidth greater than 4 GHz. The experiments show, for both applications a minimum conversion loss in the range of 6 to 8 dB and a $MIN@3dB bandwidth larger than 7 GHz. !11
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