60 GHz Double-Balanced Gate-Pumped Down-Conversion Mixers With a Combined Hybrid on 130 nm CMOS Processes

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 m A. This is the first demonstration of the double-balanced gate mixer in millimeter wave frequency.