Gain mismatch-balanced I/Q down-conversion mixer for UWB

This paper presents an I/Q down conversion mixer in the receiver of ultra-wide band (UWB) systems with gain mismatch compensation capability by integrating the two PMOS variable gain amplifiers (VGA) at the output. The I/Q mixer is designed in 0.18/spl mu/m Samsung CMOS technology. The proposed mixer operates at 1.584 GHz with the power conversion gain of 5.9 dB, IIP3 of 4.1 dB and NF of 7.9 dB. By adjusting the gain of VGA, the I and Q outputs perfectly have the same gain. LO-RF leakage is smaller than -72 dB. The designed mixer consumes total 11.5 mA from 1.8 V of supply voltage.