双波段多级低噪放的匹配设计与仿真  

Design and Simulation of a Dual-Band and Multi-stage Low Noise Amplifier

作　　者：付东洋[1] 文化锋[1] 刘太君[1] 张勋[1] 李健[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2015年第3期34-37,共4页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家自然科学基金(61371061);浙江省自然科学基金(LY12F01010)

摘　　要：针对双波段低噪声放大电路设计存在的多级匹配问题,提出一种解决双波段多级低噪放匹配的方法.首先根据每一级低噪放指标要求设置优化参数,找到输入输出最佳阻抗值,然后用串联微带线和并联微带枝节将双波段LNA的每一级输入输出阻抗值匹配到50,最后将其级联,从而实现了双波段三级LNA的设计.仿真结果表明:该低噪声放大器在2.69 GHz和3.5 GHz频点处匹配良好,噪声系数小于1 d B,S11和S22都小于-20 d B,增益大于40 d B,从而能同时传输2个非同步信号,提高了频谱利用率,并减少了带外噪声干扰.A matching method is proposed aiming at solving the design problems of dual-band low noise amplifier （LNA） circuit. Based on the index of each level in LNA, the matching network first sets the optimized parameters, then obtains the optimal input and output impedance. Next is to utilize microstrip transmission line in series and the parallel microstrip stubs to convert input and output impedances at each stage for dual-band LNA into 50ohms. Finally, the design of the dual-band multistage LNA is implemented by three-level cascade. The results show that, when the amplifier is operated at dual frequencies of 2.69 GHz and 2.70 GHz, the noise is less than 1 dB, S11 and S22 are less than 20 dB, gain is more than 40 dB, making two asynchronous signal transported simultaneously. In this way, not only is the spectrum efficiency improved but also the noise outside the band is reduced.

关 键 词：双波段 三级级联 低噪声放大器 微带传输线 

分 类 号：TN913.6[电子电信—通信与信息系统]