發(fā)布時(shí)間：2018-02-05 04:58

  本文關(guān)鍵詞： 功率放大器 Doherty 雙頻 匹配網(wǎng)絡(luò) 補(bǔ)償線(xiàn)　出處：《電子科技大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：目前無(wú)線(xiàn)通信系統(tǒng)正朝著多頻帶以及多載波高數(shù)據(jù)速率方向快速發(fā)展,在這樣的研究背景下,應(yīng)用于基站發(fā)射機(jī)中的寬帶以及多帶射頻功率放大器正逐漸成為研究熱點(diǎn)。本文通過(guò)對(duì)雙頻無(wú)源器件的研究探討了高效率雙頻段Doherty功率放大器的設(shè)計(jì)思路與方法。針對(duì)不同條件下的應(yīng)用要求,研究并實(shí)現(xiàn)了改進(jìn)型雙頻Doherty功率放大器結(jié)構(gòu)。主要工作總結(jié)如下:(1)雙頻無(wú)源器件為功率放大器雙頻拓展的基礎(chǔ)。通過(guò)對(duì)典型T型微帶以及?型微帶等雙頻電路結(jié)構(gòu)的分析與討論,設(shè)計(jì)了雙頻阻抗匹配網(wǎng)絡(luò)、雙頻補(bǔ)償線(xiàn)以及雙頻功分器等,為設(shè)計(jì)實(shí)現(xiàn)雙頻Doherty功率放大器提供了重要參考依據(jù)與無(wú)源基礎(chǔ)。(2)本文研究了一種改進(jìn)型雙頻帶匹配網(wǎng)絡(luò)拓?fù)?通過(guò)設(shè)計(jì)雙頻加載線(xiàn)與進(jìn)一步拓展典型雙頻?/4阻抗變換線(xiàn)結(jié)構(gòu)應(yīng)用范圍,使其可以在任意兩個(gè)頻率上將有源器件的輸入/輸出端反射系數(shù)匹配到系統(tǒng)標(biāo)準(zhǔn)50?負(fù)載。討論了不同工作頻率比條件下雙頻匹配網(wǎng)絡(luò)的實(shí)現(xiàn)方案,最后通過(guò)仿真驗(yàn)證該拓?fù)浣Y(jié)構(gòu)的可實(shí)現(xiàn)性。(3)本文提出了一種改進(jìn)型的雙頻相移線(xiàn)結(jié)構(gòu)作為本次設(shè)計(jì)雙頻Doherty功率放大器的補(bǔ)償線(xiàn)方案。這種結(jié)構(gòu)在兩個(gè)工作頻率上實(shí)現(xiàn)需要的不同相移,并且等效特征阻抗為50?。介紹了該結(jié)構(gòu)的理論推導(dǎo)與設(shè)計(jì)方法,并通過(guò)仿真驗(yàn)證了該方案。(4)本文在理論上系統(tǒng)的闡述了雙頻Doherty功率放大器設(shè)計(jì)方法,包含各個(gè)子部分方案的理論分析與仿真驗(yàn)證。最后設(shè)計(jì)了應(yīng)用CREE CGH40010的工作頻率為1600MHz與3500MHz的雙頻Doherty功率放大器,實(shí)測(cè)結(jié)果輸出功率大于10W,6dB回退效率分別大于41%(1600MHz)和35%(3500MHz),實(shí)現(xiàn)了雙頻工作的目標(biāo)。
[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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN722.75

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