基于谐波控制法S波段高效率功率放大器研究

发布时间：2018-01-19 11:23

本文关键词： 谐波控制高效率宽带扇形结构负载牵引　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：射频功放作为无线通讯发射机中必不可少的部件,其发展和进步对无线通讯技术具有重要意义。经多年发展,射频功放的种类和结构出现了多种形式,其中基于谐波控制法的高效率功放,由于其优秀的性能表现,已成为了当今研究的热点课题。本文基于谐波控制法,探讨和研究了通过谐波控制来提高射频功放的性能;研究了宽带高效率的谐波控制类功放;研究了宽带高效率谐波类功放和经典的Doherty架构相结合的功放形式。具体的研究内容和创新点如下:1.本文详细阐述了F类功放的设计方法,分析了输入谐波对F类功放性能的影响。通过优化设计和选用更合理的直流偏置网络,减小了电路面积,增加了带宽。选取GaN材料的10W晶体管,设计了一款F类功率放大器。测试结果表明,该放大器的性能良好。2.本文基于连续型F类(CCF)功放原理,提出了一种新的设计方法,该方法通过单独实现谐波控制和基波匹配,简化了CCF功放的设计过程。在连续型F类功放模式的基础上对谐波阻抗点进行了分析和适当拓展,由此综合出了一种新的输出匹配结构,实现了谐波调谐和基波匹配的目的。测试结果表明,在1.95-2.6GHz,输出功率可达39.7-41.7dBm,功率附加效率为60-79.9%。当测试5MHz WCMA信号时,功放的漏极平均效率达32.1%,输出功率达35.34dBm;偏移中心频点±5MHz时,ACPR为-32.85dBc和-32.66dBc;当偏移±10MHz时,ACPR为-50.49dBc和-50.89dBc。表明了基于该方法设计的功放,综合性能较好。3.本文详细阐述了Doherty功放的工作原理,分析了Doherty的窄带的原因,选择了平行式结构和更合适的特性阻抗值,通过仿真优化,拓展了Doherty固有的窄带特性,使其符合宽带功放设计的要求。最后将基于谐波控制法的连续型F类单管功放与优化后的Doherty架构相结合,利用CCF功放谐波控制具有宽带高效率的特性,以及利用Doherty架构在功率回退处具有高效率的特点,设计了一款S波段宽带高效率Doherty功率放大器。经加工测试,表明该功放性能良好。从上述三种不同功率放大器的实测结果来看,测试性能与仿真设计基本吻合,表明本文的研究方案是合理的,理论分析是正确的。本文对基于谐波控制法进行了研究,为如何通过谐波控制法来提升功放性能提供了参考。
[Abstract]:Radio frequency power amplifier is an indispensable part in wireless communication transmitter, its development and progress is of great significance to wireless communication technology. After years of development, the variety and structure of radio frequency power amplifier have appeared in various forms. Among them, the high efficiency amplifier based on harmonic control method has become a hot research topic because of its excellent performance. This paper is based on harmonic control method. The performance of RF power amplifier by harmonic control is discussed and studied. The broadband and high efficiency harmonic control amplifier is studied. This paper studies the combination of broadband and high-efficiency harmonic amplifier and classical Doherty architecture. The specific research contents and innovations are as follows: 1.This paper describes the design method of F-type power amplifier in detail. The influence of input harmonics on the performance of class F power amplifier is analyzed. By optimizing the design and selection of more reasonable DC bias network, the circuit area is reduced and the bandwidth is increased. The 10W transistor with GaN material is selected. A class F power amplifier is designed. The test results show that the amplifier has good performance. 2. Based on the principle of continuous F class CCF power amplifier, a new design method is proposed in this paper. This method simplifies the design process of CCF power amplifier by realizing harmonic control and fundamental wave matching alone. The harmonic impedance point is analyzed and expanded appropriately on the basis of continuous F-type power amplifier mode. Thus, a new output matching structure is synthesized, which realizes harmonic tuning and fundamental wave matching. The test results show that the output matching is at 1.95-2.6GHz. The output power can reach 39.7-41.7 dBm and the additional power efficiency is 60-79.9. The average drain efficiency of the power amplifier is 32.1% when the 5MHz WCMA signal is tested. The output power is 35.34 dBm; The ACPR at 卤5MHz is -32.85dBc and -32.66dBc respectively. When the deviation is 卤10MHz, the ACPR is -50.49dBc and -50.89dBc, which shows the power amplifier based on this method. This paper describes the working principle of Doherty power amplifier, analyzes the reason of narrow band of Doherty, chooses parallel structure and more suitable characteristic impedance value. Through simulation optimization, the inherent narrowband characteristic of Doherty is extended. Finally, the continuous F-type single-tube power amplifier based on harmonic control method is combined with the optimized Doherty architecture. Using CCF power amplifier harmonic control has the characteristics of broadband and high efficiency, and using Doherty architecture has the characteristics of high efficiency in power retreat. A S-band broadband and high-efficiency Doherty power amplifier is designed. The processing test shows that the power amplifier has good performance. The measured results of the three different power amplifiers mentioned above are as follows. The testing performance is basically consistent with the simulation design, which shows that the research scheme is reasonable and the theoretical analysis is correct. The harmonic control method is studied in this paper. It provides a reference for how to improve the performance of power amplifier by harmonic control method.
【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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