A high-performance low-power CMOS double-balanced IQ down-conversion mixer for 2.45-GHz ISM band applications

A 2.45GHz CMOS double-balanced IQ downconversion switching passive mixer achieves low noise figure (NF) of 16dB, high input third-intercept point (IIP3) of 2dBm, high conversion gain (CG) of 13dB, while consuming only 4-mA from a 1.8V supply. This paper also proposes a new technique for stabilizing CG, IIP3, and NF of a CMOS passive mixer from the power supply (V/sub DD/), threshold voltage (V/sub TH/), and temperature variations. The proposed technique dissolves the undesired variations by providing dynamic DC biasing voltages. Measurement of various test chips shows that the CG of the mixers are all within /spl plusmn/0.1dB for 10% V/sub DD/ variations, and within /spl plusmn/0.75dB for temperature of -40 to 90/spl deg/C.