射频功率放大器的设计(2)

西北工业大学明德学院本科毕业设计(论文)

ABSTRACT

In recent years, with the rapid development of wireless communication, radio waves as the carrier of mobile communications, wireless local area network as the representative of modern communication network has become one of the modern economy, infrastructure support, as the RF transmitter power amplifier front end of the most important circuit part, to a large extent determine the overall transmitter performance, the design quality affects the performance of the whole system. For example, determine the length of the output power of the wireless signal communication distance, which determines the efficiency of the wireless communication device battery life time.

With the help of the powerful ADS simulation software for transistor modeling, on this basis for the stability of the transistor was analyzed, using the load-pull method combined with the Smith chart for input and output impedance matching circuit simulation optimization design . The main contributions are as follows:

1. RF amplifier circuit introduces some basic theory, from the physical structure of the power amplifier analyzes the causes of the RF power amplifier nonlinear characteristic generated and its impact on the communication system, and introduces the Smith chart, stable circuit technology.

2. The basic principle of the power amplifier, power amplifier understanding of classification, introduced the technical specifications of the RF power amplifier.

3. RF power amplifier gives the detailed design process, the use of ADS simulation software, to complete a variety of measures to complete power amplifier design process, the application of load-pull method or the like to complete the design requirements, a plurality of amplifier circuit performance simulation optimization .

KEY WORDS：power amplifier，transistor，load-pull method

II

西北工业大学明德学院本科毕业设计(论文)

目 录

第一章 前言 ............................................................................................................... 1 1.1课题研究的目的及其意义 .................................................................................. 1 1.2国内外研究现状 .................................................................................................. 2 1.3 本文主要工作和内容安排 ................................................................................. 2 第二章 射频放大电路设计的基本理论 ................................................................... 4 2.1射频电路设计简介 .............................................................................................. 4 2.2器件模型 .............................................................................................................. 4 2.2.1非线性双极型器件模型................................................................................ 5 2.2.2非线性场效应晶体管器件模型.................................................................... 5 2.3传输线理论 .......................................................................................................... 6 2.4史密斯圆图 .......................................................................................................... 8 2.5 S参数 ................................................................................................................... 9 2.6 稳定性 ............................................................................................................... 10 第三章 功率放大器的基本原理和参数 ................................................................. 12 3.1功率放大器基本原理 ........................................................................................ 12 3.2功率放大器的性能参数 .................................................................................... 14 3.2.1 输出功率..................................................................................................... 15 3.2.2 功率增益..................................................................................................... 15 3.2.3 效率............................................................................................................. 16 3.2.4 线性度......................................................................................................... 16 第四章 射频功率放大器的仿真设计与分析 ......................................................... 19 4.1 射频功率放大器的设计概述 ........................................................................... 19 4.1.1功率放大器的设计步骤.............................................................................. 19 4.1.2功率放大器的指标...................................................................................... 19 4.2 射频功率放大器仿真设计软件的介绍 ........................................................... 19

III

西北工业大学明德学院本科毕业设计(论文)

4.3射频功率放大器的仿真 .................................................................................... 20 4.3.1静态工作点的选择...................................................................................... 20 4.3.2偏置及稳定性分析...................................................................................... 22 4.3.3输入输出匹配.............................................................................................. 23 4.3.4 谐波平衡仿真............................................................................................. 26 4.3.5 电路优化设计............................................................................................. 28 第五章 全文总结 ..................................................................................................... 31 参考文献 ..................................................................................................................... 33 致 谢 ................................................................ …… 此处隐藏：3793字，全部文档内容请下载后查看。喜欢就下载吧 ……