Smith圆图辅助设计低噪声宽频带放大器  

The Design of Wide Band Low Noise Amplifier With The Smith Chat Assistance

作　　者：张辉[1] 吕善伟[1] 苏东林[1] 南仁东[2] 

机构地区：[1]北京航空航天大学 [2]中国科学院国家天文台

出　　处：《电子测量技术》2004年第3期38-39,共2页Electronic Measurement Technology

摘　　要：接收微弱射频信号需要研究低噪声放大器的设计,文中在分析传统低噪声放大器设计的基础上引入对放大器匹配电路品质因数,扩宽放大器的频带;通过加入电流负反馈及在负载端并联电阻,提高放大器的稳定性、降低放大器驻波比,得到宽频带低噪声放大器的设计方法。仿真结果表明设计的放大器工作绝对稳定。A improved method of LNA(low-noise amplifier)designing is proposed here.Based on the analyzing tranditional mothod of amplifer designing.,the quality of matching metworks is taken into accout at first,in order to improve the width of the band;Secondly,designing the negative current feedback and paralling a resistance with output matching network guarantee the sta- bility and lower the VSWR furtherly.Simulation results show the amplifier is absolutely stable.These parameters satisfy the project requirement.

关 键 词：微波晶体管放大器 高电子迁移率管 低噪声放大器 SMITH圆图 

分 类 号：TN722.3[电子电信—电路与系统]