A double-balanced CMOS mixer with on-chip balun for 60-GHz receivers

This paper presents a double-balanced CMOS down-conversion mixer for 60-GHz receivers, although the mixer is designed specifically for a phased array receiver architecture. The proposed mixer uses two on-chip baluns implemented with the two top metal layers in a 0.13-μm CMOS technology. The baluns provide 180° differential outputs from applied single-ended input at the radio-frequency (RF) and local-oscillator (L O) inputs. Operating from a 1.5-V supply, the overall m easured maximum conversion gain is ~1.7 dB over the in termediate frequency band from 10.5 to 12.8 GHz (RF frequency of 57–64 GHz and LO frequency of (45.6–51.2GHz). The input-referred 3 rd -order intercept point is 14.2 dBm, when the applied LO signal is 1.5 dBm. The mixer core draws 4 mA from a 1.5-V supply.