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The paper presented a 2.4GHz fully integrated CMOS power amplifier using capacitive cross-coupling, fabricated in 0.18μm CMOS. With a 3.3-V supply voltage, PAEmax and PAE at 1 dB compression point are 34.3% and 26.8%. P1dB, Psat, and PG are 25.2dBm, 27.7dBm and 26.5dB, respectively. The advantages of the proposed capacitive-cross-coupled PA are the improvement of reverse isolation and the area saving.