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A differential D-band (140 GHz) passive imager has been demonstrated in a 65 nm CMOS technology. It achieves a minimum noise equivalent power of 26 fW/√Hz with peak responsivity of 1.2 MV/W. The core circuit consumes chip area of 950×240 μm2 with dc power consumption of 152 mW. This work further pushes imagers in CMOS technology working towards higher millimeter wave/sub millimeter wave frequencies.