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An active single-ended 30 to 60 GHz doubler/power amplifier chain MMIC based on a commercial 0.15 um GaAs pHEMT process has been developed that requires low input drive power and produces high output power with high fundamental suppression without external filter. The maximum conversion gain is 17 dB with -25 dB fundamental signal suppression and saturated output power is 19 dBm at 59 GH output frequency. Packaging and interconnects are discussed and as a alternative to wire bonding, flip-chip mounting test with SNU's MCM-D (multi-chip module) substrate are presented. These test indicate that the presented MMIC and this flip- chip technologies are especially well suited for the 60 GHz wireless communication systems.