Design and analysis of a high-linear UWB CMOS mixer

This paper describes the design, simulation and analysis of a high-linearity, high-gain, low-power, and inductorless 3.1-4.8 GHz ultra-wideband (UWB) down-conversion mixer in a 1.8V, 0.18 μm CMOS process. In the proposed structure, using the modified derivative superposition and current-bleeding techniques, the linearity of the conventional Gilbert-cell mixer is increased about 10 dBm without losing the conversion gain. In addition, there is a noticeable decrease in the power consumption of the conventional mixer. Furthermore, the S 11 and conversion gain of the mixer are hand calculated and the validity of the analytical formulas are verified by simulation results.