高效率双带Doherty功率放大器的研究

发布时间：2018-02-05 04:58

本文关键词： 功率放大器 Doherty 双频匹配网络补偿线　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前无线通信系统正朝着多频带以及多载波高数据速率方向快速发展,在这样的研究背景下,应用于基站发射机中的宽带以及多带射频功率放大器正逐渐成为研究热点。本文通过对双频无源器件的研究探讨了高效率双频段Doherty功率放大器的设计思路与方法。针对不同条件下的应用要求,研究并实现了改进型双频Doherty功率放大器结构。主要工作总结如下:(1)双频无源器件为功率放大器双频拓展的基础。通过对典型T型微带以及?型微带等双频电路结构的分析与讨论,设计了双频阻抗匹配网络、双频补偿线以及双频功分器等,为设计实现双频Doherty功率放大器提供了重要参考依据与无源基础。(2)本文研究了一种改进型双频带匹配网络拓扑,通过设计双频加载线与进一步拓展典型双频?/4阻抗变换线结构应用范围,使其可以在任意两个频率上将有源器件的输入/输出端反射系数匹配到系统标准50?负载。讨论了不同工作频率比条件下双频匹配网络的实现方案,最后通过仿真验证该拓扑结构的可实现性。(3)本文提出了一种改进型的双频相移线结构作为本次设计双频Doherty功率放大器的补偿线方案。这种结构在两个工作频率上实现需要的不同相移,并且等效特征阻抗为50?。介绍了该结构的理论推导与设计方法,并通过仿真验证了该方案。(4)本文在理论上系统的阐述了双频Doherty功率放大器设计方法,包含各个子部分方案的理论分析与仿真验证。最后设计了应用CREE CGH40010的工作频率为1600MHz与3500MHz的双频Doherty功率放大器,实测结果输出功率大于10W,6dB回退效率分别大于41%(1600MHz)和35%(3500MHz),实现了双频工作的目标。
[Abstract]:At present, wireless communication systems are developing rapidly in the direction of multi-band and multi-carrier high data rate. Broadband and multi-band RF power amplifiers used in base station transmitters are becoming the research hotspot. This paper discusses the design of high efficiency dual-band Doherty power amplifiers through the research of dual-frequency passive devices. Design ideas and methods. According to the application requirements under different conditions. The structure of improved dual-frequency Doherty power amplifier is studied and implemented. The main work is summarized as follows: 1) Dual-frequency passive device is the basis of dual-frequency expansion of power amplifier. The dual-frequency impedance matching network, dual-frequency compensation line and dual-frequency power divider are designed. This paper presents an improved dual-band matching network topology for the design and implementation of dual-frequency Doherty power amplifier. By designing dual frequency loading lines and further developing typical dual frequency lines? The r-4 impedance transform line structure can be used to match the reflection coefficients of the input / output end of the active device to the system standard 50? at any two frequencies. Load. The realization scheme of dual-frequency matching network with different operating frequency ratio is discussed. Finally, the realizability of the topology is verified by simulation. In this paper, an improved dual-frequency phase-shifted line structure is proposed as the compensation line scheme for the design of dual-frequency Doherty power amplifier. And the equivalent characteristic impedance is 50? This paper introduces the theoretical derivation and design method of the structure, and verifies the scheme by simulation.) in this paper, the design method of dual-frequency Doherty power amplifier is systematically expounded in theory. The theoretical analysis and simulation verification of each sub-scheme are given. Finally, the application of CREE is designed. The operating frequency of CGH40010 is 1600MHz and 3500MHz dual frequency Doherty power amplifier. The measured output power is greater than 10WN 6dB and the recoil efficiency is higher than 41mHz (1600MHz) and 3500MHz, respectively. The target of dual-frequency operation is realized.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722.75

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