摘要当代代无线通信系统对性能需求变得越来越高，射频功率放大器是通信系统的焦点， 他的能耗非常大，非线性最强。整个通训系统性能的优劣由射频功率放大器性能的好坏决定。关于射频功率放大器的理论基础已经有很多学者进行了充分的研究，目前主要有着更多的工程设计方面的问题。线性度和效率是设计功率放大器的重点，所以如何优化射频功率放大器的线性化和加强效率是研究方向的热点。 42897

文章中主要讲述射频功率放大器的设计。首先介绍了射频功率放大器的相关知识包括定义分类和基本性能指标，在实际设计放大器之前了解了他的通常的设计流程和设计方法。然后，在非思卡尔公司生产的MW6S004N型晶体管的基础上，利用 ADS 软件，设计了一个 L 波段射频功率放大器，功率附加效率为 48.05%，仿真增益为 19.16dB， 功率附加效率为 48.05%，结果满足设计指标。 

关键词  射频功率放大器，阻抗牵引，谐波控制 

毕业论文设计说明书外文摘要

Title      Design of RF power Amplifier in L Band     

Abstract

With the development of wireless communication technologies, there are much higher requirements to modern wireless communication system. As RF power amplifier has the largest energy consumption and the strongest non- linear effect, it acts an important  role in wireless communication systems.   

The theoretical  basis  of the RF power amplifier is  relatively perfect,  it is more about the project application problems. Because of the characteristics of the transistor and the large signal work mode,  some parameters are related each other. Linearity and efficiency are important. So the  linearization technique and the efficiency enhancement techniques  have  been widely  concerned. 

This thesis focuses on the design of the RF power amplifier. Firstly, the definition, the  classification and the basic parameters  of the RF power amplifier  have been introduced. In particular, the stability, which is not concerned on other type of amplifier, and the technique to improve the stability are introduced. According to the introduction, the design process and method of general amplifier have been put forward. And then, through the ADS simulation, a class AB power amplifier used for wireless communication at L-band with LDMOS which is made by Freescale Semiconductor  is designed.  This power amplifier can provide 16.29dB  gain and 41.42% power added efficiency in actual measurement. 

Keywords  RF power Amplifier, Impedance pull, Harmonic Control 

目   次

1 绪论 .1 

1.1 研究背景和意义  1

1.2 射频功率放大器的发展现状 .1 

1.3 论文结构及内容安排2 

2 射频功率放大器理论基础 ...3 

2.1 射频功率放大器简介.3 

2.2 射频功率放大器的分类 ·3 

2.3 射频功率放大器的性能参数.. 5 

  2.3.1 功率增益  5 

  2.3.2 增益平坦度 .6 

  2.3.3 效率 ...6 

  2.3.4 线性度与 1DB 功率压缩点 . 7 

  2.3.5 非线性失真 7 

  2.3.6 稳定性 ...9

2.4 放大器设计流程 ...10

  2.4.1 晶体管选型及 LDMOS 晶体管 ...10

  2.4.2 直流偏置 ...11 

  2.4.3 匹配电路设计与稳定性分析 12 

2.5 本章小结...14

3 射频功率放大器电路仿真设计 ..15 

3.1 设计指标... ....15

3.2 晶体管和介质基片的选择 ...15

3.3 模型导入及直流扫描..16