一种用于北斗卫星导航的射频接收前端芯片

A RF Receiver Front-End Chip for BeiDou Satellite Navigation

基于65 nm CMOS工艺设计了应用于北斗卫星导航系统的射频接收前端芯片,该射频接收前端集成了低噪声放大器、混频器、可变增益放大器、带隙基准源、偏置电路等模块。核心电路模块采用共源共栅结构低噪声放大器及双平衡吉尔伯特下变频混频器。测试结果表明,当输入射频频率覆盖北斗导航信号B3(1268.52 MHz)和B1(1561.098 MHz)时,该射频接收前端输出中频频率分别为15.5 MHz和16 MHz,增益分别在(41±1)dB和(39±1)dB波动,噪声系数分别在(3.6±0.2)dB和(3.9±0.3)dB波动。在3 V工作电压下,射频接收前端的整体功耗为120 mW,芯片面积为3.55 mm×3.35 mm,满足北斗卫星导航接收终端高集成度、低功耗及低噪声的应用需求。

A RF receiver front-end chip applied in BeiDou satellite navigation system was designed based on 65 nm CMOS process.The RF receiver front-end integrates low noise amplifier,mixer,variable gain amplifier,bandgap voltage reference,bias circuit and other circuit modules.The core circuit module uses low noise amplifier with cascode structure and double balanced Gilbert down conversion mixer.Test results show that when the input RF frequencies cover BeiDou navigation signals B3(1268.52 MHz)and B1(1561.098 MHz),the output IF frequencies of RF receiver front-end are 15.5 MHz and 16 MHz,respectively.The gain fluctuates at(41±1)dB and(39±1)dB,respectively.The noise figure fluctuated at(3.6±0.2)dB and(3.9±0.3)dB,respectively.The RF receiver front-end consumes 120 mW at a operating voltage of 3 V.The chip area is 3.55 mm×3.35 mm.It can meet the application requirement of high integration,low power consumption and low noise in Beidou satellite navigation receiver terminal.