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基于0.18μm RF CMOS工艺,采用低中频系统结构,设计了一款可应用于全球定位导航系统(GPS)L1频段和北斗二代(BD2)B1频段的低噪声卫星导航接收机的射频模拟前端芯片。该前端包括低噪声放大器、无源混频器、中频放大器、复数带通滤波器和数控可变增益放大器。其中低噪声放大器采用电流舵技术,与无源混频器一起,提高了射频前端的1dB压缩点输入功率(Pi(1dB)),有效地改善了系统的线性度。测试结果显示,在GPSL1频点,系统的最大增益107.2dB,噪声系数达到1.8dB,动态增益66dB,镜像抑制比约为39.54dB,Pi(1dB)为-41dBm,电源为1.8V时,消耗电流16mA,芯片面积1.7mm×0.8mm。
Based on the 0.18μm RF CMOS technology, a low-IF satellite navigation receiver designed for the L1 band of Global Positioning System (GPS) and the B1 band of BD2 . The front end includes low noise amplifiers, passive mixers, IF amplifiers, complex band-pass filters and NC variable gain amplifiers. Among them, the low-noise amplifier uses current steering technology, and the passive mixer increases the input power (Pi (1dB)) of the 1dB compression point at the RF front end, which effectively improves the linearity of the system. The test results show that the maximum gain of the system is 107.2dB, the noise figure reaches 1.8dB, the dynamic gain is 66dB, the image rejection ratio is about 39.54dB, the Pi (1dB) is -41dBm, and the power consumption is 1.8V 16mA, chip area 1.7mm × 0.8mm.