本文關鍵詞： 諧波控制 高效率 寬帶 扇形結構 負載牽引　出處：《電子科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：射頻功放作為無線通訊發(fā)射機中必不可少的部件,其發(fā)展和進步對無線通訊技術具有重要意義。經(jīng)多年發(fā)展,射頻功放的種類和結構出現(xiàn)了多種形式,其中基于諧波控制法的高效率功放,由于其優(yōu)秀的性能表現(xiàn),已成為了當今研究的熱點課題。本文基于諧波控制法,探討和研究了通過諧波控制來提高射頻功放的性能;研究了寬帶高效率的諧波控制類功放;研究了寬帶高效率諧波類功放和經(jīng)典的Doherty架構相結合的功放形式。具體的研究內容和創(chuàng)新點如下:1.本文詳細闡述了F類功放的設計方法,分析了輸入諧波對F類功放性能的影響。通過優(yōu)化設計和選用更合理的直流偏置網(wǎng)絡,減小了電路面積,增加了帶寬。選取GaN材料的10W晶體管,設計了一款F類功率放大器。測試結果表明,該放大器的性能良好。2.本文基于連續(xù)型F類(CCF)功放原理,提出了一種新的設計方法,該方法通過單獨實現(xiàn)諧波控制和基波匹配,簡化了CCF功放的設計過程。在連續(xù)型F類功放模式的基礎上對諧波阻抗點進行了分析和適當拓展,由此綜合出了一種新的輸出匹配結構,實現(xiàn)了諧波調諧和基波匹配的目的。測試結果表明,在1.95-2.6GHz,輸出功率可達39.7-41.7dBm,功率附加效率為60-79.9%。當測試5MHz WCMA信號時,功放的漏極平均效率達32.1%,輸出功率達35.34dBm;偏移中心頻點±5MHz時,ACPR為-32.85dBc和-32.66dBc;當偏移±10MHz時,ACPR為-50.49dBc和-50.89dBc。表明了基于該方法設計的功放,綜合性能較好。3.本文詳細闡述了Doherty功放的工作原理,分析了Doherty的窄帶的原因,選擇了平行式結構和更合適的特性阻抗值,通過仿真優(yōu)化,拓展了Doherty固有的窄帶特性,使其符合寬帶功放設計的要求。最后將基于諧波控制法的連續(xù)型F類單管功放與優(yōu)化后的Doherty架構相結合,利用CCF功放諧波控制具有寬帶高效率的特性,以及利用Doherty架構在功率回退處具有高效率的特點,設計了一款S波段寬帶高效率Doherty功率放大器。經(jīng)加工測試,表明該功放性能良好。從上述三種不同功率放大器的實測結果來看,測試性能與仿真設計基本吻合,表明本文的研究方案是合理的,理論分析是正確的。本文對基于諧波控制法進行了研究,為如何通過諧波控制法來提升功放性能提供了參考。
[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 鹵5MHz is -32.85dBc and -32.66dBc respectively. When the deviation is 鹵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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN722.75

【參考文獻】

相關期刊論文 前1條

1 張波;陳萬軍;鄧小川;汪志剛;李肇基;;氮化鎵功率半導體器件技術[J];固體電子學研究與進展;2010年01期

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本文編號：1443967