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1、.摘要摘要随着通讯工业的飞速发展，人们对各种无线通讯工具的要求也越来越高，功率辐射小、作用距离远、覆盖范围大已成为各运营商乃至无线通讯设备制造商,的普遍追求，这就对系统的接收灵敏度提出了更高的要求 ，这就对处于接收机最前端的低噪声放大器提出更高的要求：低噪声，合适的增益，工作频段内的稳定性。本文详细介绍使用 ADS 软件设计微波低噪声小信号放大器。放大器选用安捷伦的 ATF54143 增强型伪高电子迁移率晶体管(E-pHEMT)，其中工作频率范围在 2010MHz2025MHz。本文先分析了一般低噪声放大器的基本结构和要求指标和设计原则。再基于 ATF54143 晶体管初步设计匹配网络，偏置电
2、路的，和解决不稳定性的方法。最后通过 ADS 软件仿真设计优化好电路并绘制好PCB 电路图，完成电路设计，并对电路进行调试和实际电路的测试。各种测试结果表明，低噪声放大器性能良好。关键词：关键词： 低噪声放大器低噪声放大器 ATF54143 ADS 仿真仿真 阻抗匹配阻抗匹配 SMITH 圆图圆图 射频（微波）射频（微波）.AbstractWith the rapid development of communications industries, there is a variety of wireless communication tools have become more soph
3、isticated requirements, small power radiation, the role of distance, large-scale coveragehas become the largest operator of wireless communications equipment as well as manufacturers, the general pursuit of this sensitivity of the system to receive a higher demand, which on most front-end receiver i
4、n the low-noise amplifier to higher requirements: low-noise, the appropriate gain, the stability of working frequency band.This paper describes the use of ADS software design of microwave low-noise small-signal amplifier. Selection of Agilent Technologiess ATF-54143 amplifier transistor (E-pHEMT), W
5、ork in which frequency range 2010MHz 2025MHz. This article first analyzes the general low-noise amplifier of the basic structure and requirements of indicators and design principles. Re-ATF54143 transistors based on the preliminary design of matching networks, bias circuits, and methods to resolve t
6、he instability. Finally, ADS software simulation through good circuit design optimization and a good PCB circuit diagram drawn to complete the circuit design and circuit debug and test the actual circuit. Various test results show that low-noise amplifier performance.Key words: low-noise amplifier A
7、TF54143 ADS simulation SMITH Chart impedance matching RF (microwave).第一章 绪论.41.1 低噪声放大器.41.1.1 概念.41.1.2 主要功能.51.1.3 主要应用领域.51.2 低噪声放大器的研究现状.51.3 本文的主要研究成果和内容安排.7第二章 低噪声放大器的分析与研究.82.1 低噪声放大器的基本结构.82.2 低噪声放大器的基本指标.82.2.1 噪声系数.92.2.2 增益.92.2.3 输入输出驻波比.102.2.3 反射系数.102.2.4 放大器的动态范围（IIP3）.102.3 低噪声放大器设计设计的基本原则.112.3.1 低噪声放大管的选择原则.112.3.2 输入输出匹配电路的设计原则.11第三章 低噪声放大器的设计.143.1 放大器设计的主要流程.143.2 低噪声放大管的选择.143.3 稳定性计算.163.4 输入输出匹配电路电路设计.173.5 偏置电路.183.6 电路中需要注意的一些问题.18第四章 ADS 软件仿真设计及电路的最终实现.204.1 ADS 软件介绍.
