摘要
设计了一种GPS接收机射频前端电路,采用三级混频器抑制镜像信号,并进行优化滤波。基于ATF54143设计了适用于接收机前端电路的低噪声放大器,采用源极串接负反馈的方法提高电路稳定性并利用ADS软件进行仿真。构建了基于GPS L1波段(1575.24 MHz)卫星信号射频接收前端仿真平台,利用自动增益控制元件调整输出信号,实现大动态范围。对射频前端电路整体的增益、灵敏度、三阶截断点等指标进行了测试,讨论了电路三阶互调失真特性与噪声系数的关系。仿真结果表明,设计的低噪声放大器稳定性好,噪声系数低,射频前端电路具有良好的线性度与较大的动态范围,对实现多射频链路数字中频接收机大动态范围稳定接收提供了一个有效的解决方案。
A GPS RF front-end receiving circuit was designed.The stage of the mixer was three and the signal of hybrid frequency was optimized through multiple filters to suppress the image signal.Based on ATF54143,a low-noise amplifier suitable for the front-end circuit of the receiver was designed.The source-series negative feedback method was used to improve the stability of the circuit and simulate with ADS.The simulation platform for the RF front-end receiving circuit based on the L1 wave band was built.And AGC was used to achieve a large dynamic range of the RF receiver front-end.The gain,sensitivity,noise figure,IP3 and other indicators of RF front-end were simulated by the software simulation tools.The noise figure of the third-order intermodulation distortion receiver of the RF front-end circuit was discussed.The simulation results show that the designed low noise amplifier has good stability and low noise figure.The RF front-end circuit has good linearity and large dynamic range,which can provide an effective solution for achieving stable reception of large dynamic range of digital IF receivers with multiple RF links.
作者
范宇清
程二威
魏明
陈亚洲
FAN Yuqing;CHENG Erwei;WEI Ming;CHEN Yazhou(National Key Laboratory of Electromagnetic Environment Effects,Shijiazhuang Campus of Army Engineering University,Shijiazhuang 050005,China)
出处
《兵器装备工程学报》
CAS
北大核心
2020年第2期117-122,共6页
Journal of Ordnance Equipment Engineering
基金
国家自然科学基金面上项目(51677191)
振动模式混响室内部电磁特性仿真与试验研究基金资助.
关键词
射频前端
超外差
下变频
自增益控制
RF front-end
super-heterodyne
down-conversion
automatic gain control
作者简介
范宇清(1995—),男,硕士研究生,主要从事电磁环境模拟与防护技术研究;通讯作者:陈亚洲(1975—),男,博士,教授,主要从事强电磁场环境模拟研究。
