【摘要】：近年來,隨著無線通信迅猛發(fā)展,對網(wǎng)絡容量和數(shù)據(jù)傳輸能力的需求日益增強。為了滿足日益增加的通信需求,大量基站被建造。另一方面,隨著經(jīng)濟發(fā)展,人民生活水平提高,手機使用量猛增已經(jīng)進入千家萬戶。功率放大器作為無線通信中不可或缺的重要組成部分,其性能直接影響無線通信的質量。并且功率放大器是無線通信系統(tǒng)中主要的能耗元件,其效率直接影響到無線通信中電力資源的利用率,由于無線通信設備數(shù)量眾多,高效率的功率放大器將節(jié)約大量電力資源,因此高效率功率放大器研究對于響應低碳環(huán)�？沙掷m(xù)發(fā)展的號召節(jié)約能源有著重要意義。本文先介紹了放大器基本工作原理、分類及其性能指標,對比分析了各放大器工作狀態(tài)及其特點。由于F類放大器具有高效率的特點,選取F類放大器作為主要研究對象,并詳細介紹分析了F類放大器工作原理。然后介紹了Doherty放大器工作原理、工作狀態(tài),以及由其發(fā)展的各種結構的Doherty放大器。并將F類放大器與Doherty放大器結合,既有F類放大器高效率的特性,又能夠在一定回退功率范圍內保持這種高效率。通過仿真設計一種對稱結構Doherty放大器,進而測試驗證了其性能,根據(jù)測試結果發(fā)現(xiàn)其不足并進行改進。本文主要工作包含以下幾個方面:首先選取CREE公司的CGH40010晶體管,通過Agilent公司的ADS2009進行仿真設計,設計了一款單級F類放大器和主功放工作在F類工作點的對稱結構的Doherty放大器。并將兩種放大器加工測試,通過測試分析其不足,進而提出改進方法,通過ADS2009進行仿真,驗證改進方法的可行性。根據(jù)實際測試發(fā)現(xiàn),F類放大器以及對稱結構Doherty放大器在中心頻率2.1GHz處都具有較高的效率,其中F類放大器在10W輸出功率時PAE達到70%,對稱結構Doherty放大器在回退范圍內PAE達到53%以上。通過分析,發(fā)現(xiàn)由于對稱結構Doherty放大器峰值功放電流小造成了回退功率不夠,因此通過ADS2009仿真設計了一款非對稱結構Doherty,通過仿真結果發(fā)現(xiàn)非對稱結構在回退約6dB時效率達到70%以上。
[Abstract]:In recent years, with the rapid development of wireless communication, the demand for network capacity and data transmission capacity is increasing. In order to meet the increasing demand for communication, a large number of base stations have been built. On the other hand, with economic development, people's living standards, mobile phone use has soared into thousands of households. Power amplifier is an indispensable part of wireless communication, and its performance directly affects the quality of wireless communication. Power amplifier is the main energy consumption component in wireless communication system, and its efficiency directly affects the utilization of power resources in wireless communication. Because of the large number of wireless communication equipment, the high efficiency power amplifier will save a lot of power resources. Therefore, the study of high efficiency power amplifier is of great significance for energy conservation in response to the call of low carbon environmental protection and sustainable development. In this paper, the basic working principle, classification and performance index of the amplifier are introduced, and the operating state and characteristics of each amplifier are compared and analyzed. Due to the high efficiency of the class F amplifier, the class F amplifier is selected as the main research object, and the working principle of the class F amplifier is introduced and analyzed in detail. Then, the working principle and working state of Doherty amplifiers are introduced. The Doherty amplifiers with various structures developed by them are also introduced. The combination of class F amplifier and Doherty amplifier not only has the characteristics of high efficiency of class F amplifier, but also can keep the high efficiency in a certain range of recoil power. A symmetrical Doherty amplifier is designed by simulation, and its performance is verified by test. The shortcomings are found and improved according to the test results. The main work of this paper includes the following aspects: firstly, the CGH40010 transistors of CREE Company are selected and simulated by ADS2009 of Agilent Company. A single stage F type amplifier and a symmetric Doherty amplifier with the main power amplifier working at the F working point are designed. Two kinds of amplifiers are processed and tested, and their shortcomings are analyzed, and then an improved method is put forward. The feasibility of the improved method is verified by ADS2009 simulation. According to the actual test, the class F amplifier and the symmetrical structure Doherty amplifier have high efficiency at the center frequency 2.1GHz, in which the F type amplifier has a PAE of 70 when the output power is 10 W. The PAE of the symmetrical Doherty amplifier is over 53% in the back range. Through analysis, it is found that the low peak power amplifier current of the symmetrical Doherty amplifier leads to the insufficient back-to-back power, so an asymmetric structure Doherty, is designed by ADS2009 simulation. The simulation results show that the efficiency of the asymmetric structure is over 70% when the 6dB is withdrawn.
【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

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相關碩士學位論文 前1條

1 吳毅威;高效率功率放大器的研究與設計[D];電子科技大學;2010年

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本文編號：2317734