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A 71-80 GHz amplifier using 0.13-mum standard mixed signal/radio frequency complementary metal-oxide-semiconductor (CMOS) technology is presented in this letter. This four-stage cascade thin-film microstrip amplifier achieves the peak gain of 7.0 dB at 75 GHz. The 3-dB frequency bandwidth range is from 71 to 80 GHz. The amplifier demonstrates the highest amplification frequency and smallest chip size among previous published millimeter-wave (MMW) 0.13-mum CMOS amplifiers.