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摘要射频功率放大器是现代无线通信系统发射机中的关键模块，其性能的优劣直接影响着通信的质量和效率。目前大多数的功放模型和线性化方法都局限于窄带应用，当信号带宽增大导致放大器记忆效应明显时，传统的线性化方法对功放非线性的补偿效果就会变得很差。为了改善宽带放大器的线性度，近年来考虑记忆效应的功放建模和线性化方法成为新的研究趋势。
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本论文先介绍了功率放大器的非线性特性和记忆效应特性以及各种功率放大器行为模型，然后选取无记忆多项式模型，记忆多项式模型和Volterra级数简化模型作为研究对象，分别研究这几种行为模型的数学结构、测量以及模型参数提取过程，最终对这几种行为模型的建模精度进行了比较和评估，并对结果做出了分析。8670
关键词 功率放大器 行为模型 多项式 非线性 记忆效应
毕业设计说明书（论文）外文摘要
Title Study of Power Amplifier Behavior Models
Abstract
RF power amplifier is the most important part of the transmitter of modern wireless communication system, and its performance influences the quality and efficiency of communication in great degree. Most of the power amplifier models and linearization methods are confined to the narrow-band applications, which therefore leads to poor linearity compensation effect of traditional power amplifiers linearization methods when the signal bandwidth grows and memory effect of power amplifier increases. In order to improve the linearity of the broadband power amplifier, studys of the power amplifier models with memory effect and linear method become the new trend in recent years.
This article first describes the nonlinear characteristics of the power amplifier and memory effect characteristics as well as various power amplifier behavioral models, and then select the memory polynomial model, the memory polynomial model and Volterra series simplified model for the study, respectively, to study the mathematical structure of several behavioral models, measurements, and model parameter extraction process, and ultimately the several acts of modeling accuracy compared and evaluated, and the results made.
Keywords Power amplifier Behavioral model Polynomial
Nonlinear Memory effect
目次
1 绪论 1
1．1 功率放大器行为模型研究的目的与意义 1
1．2 功率放大器行为模型的研究现状 1
1．3 功率放大器行为模型的应用与优点及建模过程简介 2
1．4 本文的内容安排 5
2 射频功率放大器的特性 6
2．1 功率放大器的非线性特性分析 6
2．2 功率放大器的记忆效应分析 7
2．3 解决功放非线性特性和记忆效应的模型简述 8
3 射频功率放大器的行为模型 11
3．1 无记忆多项式模型 11
3．2 有记忆的多项式模型 15
3．3 Volterra级数简化模型 23
4 四类功放行为模型的比较和评估 30
4．1 时域I/Q信号幅度图 30
4．2 AM-AM和AM-PM图 30
4．3 频谱图 31