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Two 60-GHz compact double-balanced gate-pumped mixers using standard bulk 0.13 m CMOS process are presented. The homodyne and heterodyne mixers utilize small-size combined hybrids and demonstrated a small chip size of 0.8 0.85 and 0 7 0 7 mm 2 , including pads. With 5 dBm LO power, the best measured conversion gains are 1 and 0 dB in the 3 dB bandwidths of 15 GHz from 54 to 69 GHz and 14 GHz from 53 to 67 GHz RF. The LO-to-RF isolations are greater than 45 dB at a low bias of 1.2 V and 12 mA. This is the first demonstration of the double-balanced gate mixer in millimeter wave frequency.

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