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A Gilbert-cell direct up-conversion mixer is realized for 57-64-GHz unlicensed-band applications. The mixer with on-chip stacked inductors and LO, RF baluns is fabricated in 0.25-¿¿m SiGe:C BiCMOS technology. The fabricated mixer achieves conversion gain of 4 ¿¿ 1.5 dB and 5 ¿¿ 1 dB for upper and lower sideband, respectively, in frequency range from 53 to 64 GHz. The LO-to-RF isolation is higher than 30 dB. The mixer has IF bandwidth of 4 GHz, and the output-referred 1-dB compression point of -9.5 dBm. It occupies a chip area of 0.46 mm ¿¿ 0.46 mm and consumes 10 mA with supply voltage of 2.5 V.