A novel 1.5V DC offset cancellation CMOS down conversion mixer

This paper presents a novel DC offset cancellation mixer for a direct conversion receiver. The proposed mixer is designed in a TSMC 0.18 /spl mu/m CMOS technology with a supply voltage of 1.5V for 2.1 GHz applications. The extra feedback circuitry is used to cancel the DC offset; common mode feedback (CMFB) is used for active load. The designed mixer has a conversion gain of 33 dB, NF of 3.9 dB and -13 dBm of IIP3. The DC offset is observed as 2%. Moreover, the proposed mixer consumes only 5.4 mA of current.