24GHz高线性低功耗CMOS混频器的设计

Design of 24GHz high linearity low power CMOS mixer

采用一种新颖的前馈补偿差分跨导结构和LC-tank折叠共源共栅技术设计了一种适用于汽车防撞雷达系统前端的24 GHz高线性低功耗CMOS下变频混频器,详细分析了Gilbert单元混频器的线性度指标和其优化技术。该混频器工作电压为1.8 V,射频信号为24.0 GHz,中频信号为100 MHz,采用TSMC 0.18μm RF CMOS工艺实现了电路仿真和版图的设计,仿真结果表明:该混频器IIP3可达4 dBm,增益为-9.2 dB,功耗为5.7 mW。

A feedforward compensated differential transconductor and LC-tank folded-cascode structure are used to design a 24 GHz high linearity low power consumption down conversion mixer which is used to automotive anticollision radar system. The Gilbert cell mixer＇ s linearity and the optimization technology are detailed analyzed. This circuit is simulated with TSMC 0.18 μm RF CMOS process, and the layout is designed. The suppling voltage is 1.8 V, a RF signal is 24.0 GHz and an IF frequency is 100 MHz. The simulation results show that the IIP3 of the proposed structure can achieve 4dBm, gain is -9.2 dB and power consumption is 5.7 mW.