本文選題：射頻功率放大器　切入點：Doherty功放　出處：《北京郵電大學》2015年碩士論文

【摘要】：隨著科學技術(shù)的快速發(fā)展,無線帶寬異常緊張現(xiàn)象日益嚴重,促使現(xiàn)代無線通信系統(tǒng)基站子系統(tǒng)朝著高帶寬、快速率、高效率方向發(fā)展,而在無線通信系統(tǒng)基站子系統(tǒng)中,射頻功率放大器作為發(fā)射機的末端,它的功能主要是將直流功率轉(zhuǎn)換為射頻發(fā)射信號,因此射頻功率放大器是整個系統(tǒng)最大的耗能器件,在很大程度上決定了基站的耗電量、輸出功率的大小以及發(fā)射機整體的線性度。 本文以提高功放效率和功放線性度為目的,分別對Doherty技術(shù)和線性化技術(shù)進行了研究與分析。本文采用經(jīng)典兩級Doherty結(jié)構(gòu)來提高功放效率,預失真技術(shù)提升功放線性度。 Doherty功放的設計采用了飛思卡爾(Freescale)公司的MRF6V3090N芯片,主要工作如下： (1)對Doherty放大器理論進行了分析研究,同時對設計時的注意要點,特別是阻抗變換和Offset-line微帶線理論做出了重點分析。 (2)根據(jù)有源負載牽引理論,主要設計了一款中心頻率為400MHz,工作帶寬為30MHz,功率回退-6dB時工作效率不低于40%的Doherty功率放大器。 模擬預失真器的設計采用了Scintera公司的SC1894芯片,根據(jù)芯片手冊搭建外圍電路。由于需要將功放輸出功率耦合一部分信號出來反饋給SC1894,以使模擬預失真器達到最佳性能,提高功放的線性度。其中耦合器為平行微帶耦合器。
[Abstract]:With the rapid development of science and technology, the phenomenon of abnormal shortage of wireless bandwidth is becoming more and more serious, which makes the base station subsystem of modern wireless communication system develop towards the direction of high bandwidth, fast rate and high efficiency, while in the base station subsystem of wireless communication system,As the end of transmitter, the function of RF power amplifier is mainly to convert DC power into RF transmitting signal, so RF power amplifier is the biggest energy dissipation device in the whole system, which determines the power consumption of base station to a great extent.The output power and the overall linearity of the transmitter.In order to improve the efficiency and linearity of power amplifier, Doherty and linearization techniques are studied and analyzed respectively in this paper.In this paper, the classical two-stage Doherty structure is used to improve the efficiency of power amplifier, and the predistortion technique is used to improve the linearity of the amplifier.The design of Doherty power amplifier adopts the MRF6V3090N chip of Freescale of Freescale, the main work is as follows:1) the theory of Doherty amplifier is analyzed, and the key points of design, especially impedance transform and Offset-line microstrip line theory, are analyzed.The analog predistorter is designed with Scintera SC1894 chip, and the peripheral circuit is built according to the chip manual.Due to the need to feedback a part of the output power coupling signal to SC1894, the analog predistorter can achieve the optimal performance and improve the linearity of the amplifier.The coupler is a parallel microstrip coupler.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN722.75

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本文編號：1719143