A NEW 5-GHz CMOS MMIC FOR DOWN CONVERSION WITH AN ACTIVE BALUN AND CURRENT-FOLDED MIXER

摘要

A new 5-GHz CMOS MMIC for a down-conversion structure with an active balun and current-folded mixer is proposed for improving linearity, LO-to-RF isolation, and conversion gain with low voltage supply. It features a current-folded mirror with a source-degeneration active balun, thus avoiding the need for an extra transformer balun and amplifier for the RF signal. The proposed new CMOS mixer is implemented using a CMOS 0.18-μm standard process and 40 mA from a 1.8-V voltage supply. The measured results show that the conversion gain and IP{sub}(1dB) are more than 3.7 dB and -6.5 dBm, respectively. Furthermore, the mixer exhibits good performances on IIP{sub}3 and LO-to-RF isolation with 12 dBm and 43 dB, respectively.