基于CMOS工艺的全集成高线性度可重构全球卫星导航系统射频接收机

Fully-Integrated Reconfigurable CMOS Global Navigation Satellite System Receivers with High-Linearity

介绍采用CMOS工艺设计全球卫星导航系统(GNSS)中射频接收机的可重构方法与高线性度技术.为完成多模多频接收,系统采用双通道结构,同时独立地接收两个不同频段的导航信号;针对不同导航系统的信号特征,接收机带宽可自由配置.此外,针对复杂环境下GNSS接收机高线性度要求,采用将混频器作为射频接收机第1级的系统结构,旁路低噪声放大器,从而提高系统线性度.GNSS射频接收机在0.18μm CMOS工艺下流片测试,工作频率在1.2/1.57GHz,噪声系数为2.5/2.7dB,镜像抑制比为28dB,最大电压增益110dB,增益动态范围73dB.采用高线性度结构后,输入1dB压缩点由-58dBm提高为-3dBm,接收机线性度显著提高.

A fully-integrated reconfigurable CMOS receiver front-end architecture for multi-mode multiband Global Navigation Satellite Systems(GNSSs)is proposed.Two reconfigurable channels are integrated to simultaneously process signals of any two types of bandwidth around the radio frequency(RF)bands of 1.2 and 1.57 GHz.For specific circumstance which has strong interference,mixer-first structure is adopted to greatly improve the system linearity.Implemented in a 0.18μm CMOS process,the GNSS receiver front end shows a total noise figure of 2.5/2.7 dB at 1.2/1.57 GHz respectively,a maximum voltage gain of 110 dB,and a gain dynamic range of 73 dB.The input referred 1 dB compression point is raised from-58 dBm to-3 dBm for the high-linearity receiver configuration.