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A fully integrated 5.5 × 8.1 mm2 low temperature cofired ceramic (LTCC) power amplifier module for 5-6.5 GHz has been realised in a 40 GHz-fT-BiCMOS technology. No external components are required. At 1 to 2.4 V supply voltages output powers of 17.5 to 24.8 dBm are achieved at 5.9 GHz. The respective power added efficiency is 28 to 36%. The small-signal gain is 23 dB.