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本论文采用ADS2011仿真软件,使用Avago公司的ATF54143晶体管作为主要器件,设计了频率范围为2.35~2.45GHz、中心频率为2.4GHz的LNA,其性能指标为:噪声系数<1dB,增益>13dB,输入输出驻波比<2,基本上达到了预期的效果。设计过程分为四步。第一步是在明确放大器的性能指标后选择晶体管,然后进行直流偏置电路的设计。第二步是放大器的稳定性分析与设计。第三步就是放大器电路的输入和输出匹配。输入匹配电路以最小噪声系数来匹配网络,输出匹配电路以最大增益来匹配网络。第四步就是电路设计完成之后进行电路的优化和改进,以达到放大器的设计目标。最后是画原理图和采用Altium Design软件完成电路的PCB版图制作、电路调试以及实物制作。
In this thesis, the ADS2011 simulation software is used to design the LNA with the frequency range of 2.35 ~ 2.45GHz and the center frequency of 2.4GHz using the Avago ATF54143 transistor as the main device. The performance index is: noise figure <1dB, gain> 13dB, input Output VSWR <2, basically achieved the desired effect. The design process is divided into four steps. The first step is to select the transistor after specifying the amplifier’s specifications and then designing the DC bias circuit. The second step is the stability of the amplifier analysis and design. The third step is to match the input and output of the amplifier circuit. The input matching circuit matches the network with a minimum noise figure, and the output matching circuit matches the network with maximum gain. The fourth step is the circuit design is completed after the circuit optimization and improvement in order to achieve the design goals of the amplifier. Finally, draw the schematic diagram and use Altium Design software to complete the circuit PCB layout, circuit debugging and in-kind production.