基于ADS的S波段平衡式宽带低噪声放大器设计

针对宽带雷达接收前端的应用，基于ADS软件设计了一种S波段平衡式宽带低噪声放大器。在软件仿真中使用晶体管的Spice模型，在确定直流工作点后进行输入端的最小噪声阻抗匹配和输出端的最大增益阻抗匹配，最后给出了仿真结果和版图设计。同时采用新型S波段90°宽带功分器用于平衡式LNA的电路，大大提高了放大器的电性能，显著减小了整个电路的尺寸。在此将原理图一版图联合仿真用于LNA的设计优化，将整个电路作为一个模型进行EM分析，得出了一个可以比原理图仿真更接近实际电路的结果，同时有效提高了产品的研发效率，缩短小了研制周期。

Design of S band wideband balance LNA with ADS

An ADS-based design of S-band balanced-broadband low-noise amplifier(LNA) for broadband radar front-end is presented in this paper.The Spice model of the E-PHEMT is used in the simulation software.After the DC operating point is conformed,the minimum noise figure impedance matching in the input port and the maximum gain impedance matching in the output port were designed while the simulation result and layout was offered.The 2-way 90° wide band power splitter was integrated with the balanced LNA.It is the way which improved the electronical performance of the amplifier much more and reduced the dimension of the entire circuit observably.The schematic-EM-co-simulation was adopted in the circuit design and optimization of LNA,in which an EM analysis was performed on the whole circuit as just one physical model,so that the results can approach the measured results more than that of the schematic simulation.This method can shorten the design period and bring about a high design efficiency.