多级低噪声功率放大器及功率合成技术研究

发布时间：2018-03-24 14:23

  本文选题：低噪声放大器　切入点：驱动级放大器　出处：《哈尔滨工业大学》2016年硕士论文

【摘要】：在无线接收系统中,低噪声功率放大器作为接收前端,其噪声以及增益特性对整个接收系统起到决定性作用。在移动无线网、WLAN、雷达系统等无线设备中,天线接收到微弱电磁信号首先经过低噪声功率放大器,将携带信息的无线信号进行初级放大。作为射频系统工程应用的重要部分,低噪声放大器的设计一直是射频电路领域的研究热点。本文从WLAN无线系统的应用出发,通过对平衡式低噪声放大器的特性分析,设计出了一款由分支线定向耦合器构成的低噪声功率放大器系统。具体研究工作如下:首先,通过对低噪声功率放大器和驱动功率放大器的参数的分析以及特性的研究,利用ATF-54143和ATF-50189两款高电子迁移率场效应管分别设计了低噪声功率放大器和驱动级功率放大器。其次,通过对各种功率合成技术的分析,采用平衡式结构进行系统整体结构设计。在平衡式结构中,分支线耦合器的一致性对输出合成产生重要影响。因此,本文利用传统的曲流方法,设计了一款小型化的分支线定向耦合器。设计完成的定向耦合器尺寸为0.18λ×0.13λ。最后,对所设计的低噪声放大器、驱动功率放大器以及小型化分支线耦合器分别进行了加工。并且利用安捷伦N5227A矢量网络分析仪进行了测试。测试结果表明,低噪声放大器、驱动功率放大器以及分支线耦合器的加工测试结果基本满足设计要求。
[Abstract]:In the wireless receiving system, the noise and gain characteristics of the low-noise power amplifier as the front end of the receiver play a decisive role in the whole receiving system. The antenna receives the weak electromagnetic signal through the low noise power amplifier, and amplifies the wireless signal which carries the information. As an important part of the radio frequency system engineering application, the antenna receives the weak electromagnetic signal. The design of low noise amplifier (LNA) has been a hot topic in the field of RF circuits. Based on the application of WLAN wireless system, the characteristics of balanced LNA are analyzed in this paper. A low noise power amplifier system composed of branch line directional coupler is designed. The specific research work is as follows: firstly, through the analysis of the parameters and characteristics of the low noise power amplifier and the driving power amplifier, The low noise power amplifier and the drive stage power amplifier are designed using ATF-54143 and ATF-50189 high electron mobility FET respectively. Secondly, through the analysis of various power synthesizer techniques, the low noise power amplifier and the drive stage power amplifier are designed. The balanced structure is used to design the whole system structure. In the balanced structure, the consistency of the branch line coupler has an important effect on the output synthesis. Therefore, the traditional meandering method is used in this paper. A miniaturized branch line directional coupler is designed. The dimension of the designed directional coupler is 0.18 位 脳 0.13 位. Finally, for the designed low-noise amplifier, The driving power amplifier and the miniaturized branch line coupler are machined, and tested by the Agilent N5227A vector network analyzer. The test results show that the low noise amplifier, The test results of driving power amplifier and branch line coupler basically meet the design requirements.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN722.75
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本文编号：1658685