A up-conversion ring mixer is presented in this paper using 0.18 μm standard CMOS technology. By employing a weak inversion biasing technique, the ring mixer can operate at low dc consumption power and low LO drive power while maintaining reasonable conversion gain. The MMIC exhibits flat measured conversion gain of 2 ± 2 dB from 15 to 34 GHz via 3 dBm of LO drive. At low LO drive power mode of 0 dBm, the mixer has conversion gain of 1.5 ± 2.5 dB from 15 to 34 GHz. Due to the double-balanced ring topology, the mixer demonstrates high LO to RF isolation of 45 dB. The dc power consumption is only 2.749 mW from 1.2 V supply voltage.