應(yīng)用于多模多頻的寬帶高效率功率放大器設(shè)計(jì)
發(fā)布時(shí)間：2018-09-11 09:03
【摘要】：隨著第三代(3G)移動(dòng)通信技術(shù)的普及應(yīng)用和第四代(4G)移動(dòng)通信趨于成熟的發(fā)展,現(xiàn)代移動(dòng)通信系統(tǒng)呈現(xiàn)出多種通信制式并存、多個(gè)通信頻段并列的局面。多模式、多頻段系統(tǒng)操作不可避免地成為了未來無線移動(dòng)通信系統(tǒng)的發(fā)展趨勢。各種通信制式均朝著高信號(hào)峰均比(Peak-to-Average Power Ratios,以下簡稱PAPR)、多載波、大信號(hào)容量的方向發(fā)展。在現(xiàn)如今倡導(dǎo)綠色、節(jié)能、環(huán)保的時(shí)代背景下,如何把不同工作模式的調(diào)制系統(tǒng)在同一工作平臺(tái)上并存實(shí)現(xiàn)越來越引起人們的關(guān)注,這些都對(duì)無線通信系統(tǒng)中發(fā)揮著重要作用的寬帶功率放大器提出了更高的要求。作為無線通信系統(tǒng)發(fā)射機(jī)末端的核心模塊,功率放大器的性能直接影響了整個(gè)通信系統(tǒng)的信號(hào)傳輸質(zhì)量。因此,在保持高信號(hào)峰均比和高效率工作的同時(shí),進(jìn)一步擴(kuò)大功率放大器的工作帶寬具有非常重要的現(xiàn)實(shí)意義。本文的主要工作集中在寬帶高效率功率放大器的研究和設(shè)計(jì)上。論文首先介紹了功率放大器的基礎(chǔ)理論知識(shí),包括功率放大器的分類、性能參數(shù)指標(biāo),以及功放設(shè)計(jì)中核心的負(fù)載線理論及負(fù)載牽引技術(shù);接著介紹了幾種常用的寬帶功放實(shí)現(xiàn)技術(shù)和效率提升技術(shù),著重對(duì)功率放大器飽和輸出及功率回退兩種不同情況下的效率提升技術(shù)進(jìn)行對(duì)比研究,為后文寬帶高效率功放的實(shí)現(xiàn)提供理論依據(jù);然后對(duì)Doherty功率放大器的基本原理以及其核心的有源負(fù)載牽引理論進(jìn)行了研究,對(duì)Doherty功放不同工作狀態(tài)下負(fù)載阻抗的動(dòng)態(tài)變化過程和效率特性進(jìn)行分析,并簡單介紹了幾種新型的Doherty功放結(jié)構(gòu)。基于前述功放基礎(chǔ)理論以及一些拓展帶寬、提升效率的技術(shù)方法,本文采用一種簡單實(shí)用的寬帶直流偏置結(jié)構(gòu),并利用源/負(fù)載牽引仿真確定電路在整個(gè)工作頻段內(nèi)的最優(yōu)阻抗趨勢并繪制出阻抗趨勢圖,然后選取簡單的匹配結(jié)構(gòu),利用Smith圓圖軌跡法設(shè)計(jì)出匹配網(wǎng)絡(luò),實(shí)現(xiàn)了寬帶高效率功率放大器的設(shè)計(jì),方法簡便,電路結(jié)構(gòu)簡單。接著以寬帶高效率單級(jí)功放為基礎(chǔ),選取合適的Doherty功放結(jié)構(gòu),并提出一種新型的低輸出阻抗匹配方法,結(jié)合寬帶匹配網(wǎng)絡(luò)和寬帶阻抗變換網(wǎng)絡(luò)實(shí)現(xiàn)了寬帶反向Doherty功放的設(shè)計(jì),方法簡單。按照上述設(shè)計(jì)方法,首先針對(duì)低功率級(jí)寬帶高效率功率放大器的應(yīng)用完成設(shè)計(jì)。第一步仿真并實(shí)現(xiàn)了10W寬帶高效率功率放大器,測試結(jié)果顯示,在工作頻段1.8-2.7GHz內(nèi),電路的飽和輸出功率在42-42.5dBm之間,飽和狀態(tài)下功率附加效率在56%-67.8%之間,輸出功率方面的性能優(yōu)勢明顯。第二步基于上述電路,設(shè)計(jì)并實(shí)現(xiàn)了工作在1.8-2.7GHz的20W寬帶反向Doherty功放,測試結(jié)果顯示,在連續(xù)波信號(hào)下飽和輸出功率達(dá)到43.2-45.1dBm,在功率回退6.7-8.6dB(Pout=36.5dBm)時(shí),電路的漏極效率在41.5-45.3%之間。用WCDMA信號(hào)驅(qū)動(dòng)該功率放大器,當(dāng)Pout=36.5dBm時(shí),電路的漏極效率在45.3-48.6%之間,在信號(hào)頻偏5MHz的情況下,ACPR(Adjacent Channel Power Ratio,相鄰信道功率比)的值均小于-27.4dBc,在2.1GHz處甚至達(dá)到了-40.3dBc。據(jù)作者所知,該電路的工作帶寬在現(xiàn)有的文章報(bào)道中是最寬的。其次,針對(duì)高功率級(jí)寬帶高效率功率放大器的應(yīng)用完成設(shè)計(jì)。第一步完成了100W寬帶高效率功放的仿真設(shè)計(jì)及實(shí)物測試,測試結(jié)果顯示,在工作頻段1.8-2.7GHz內(nèi),除了2.7GHz的輸出功率較差外(Psat=47.5dBm),其他頻段內(nèi)電路的飽和輸出功率在49.3-50.5dBm之間,整個(gè)頻段飽和輸出下的功率附加效率在55.3%-65.7%之間。第二步基于上述電路,設(shè)計(jì)并實(shí)現(xiàn)了工作在1.8-2.7GHz的200W寬帶反向Doherty功放,測試結(jié)果顯示,在整個(gè)工作頻段內(nèi),電路的P-3輸出功率在47.5-52.93dBm之間,各頻點(diǎn)功率回退至Pout=46dBm時(shí),電路的漏極效率在34.2%-45.9%之間。本文對(duì)于寬帶高效率功率放大器以及寬帶Doherty功率放大器的設(shè)計(jì)方法作了較為全面的分析總結(jié),基于GaN HEMT功率管設(shè)計(jì)了工作在1.8-2.7GHz的10W寬帶高效率功率放大器、20W寬帶Doherty功率放大器和100W寬帶高效率功率放大器、200W寬帶Doherty功率放大器,為現(xiàn)代移動(dòng)通信提供了現(xiàn)實(shí)的借鑒意義。
[Abstract]:With the popularization and application of the third generation (3G) mobile communication technology and the mature development of the fourth generation (4G) mobile communication, the modern mobile communication system presents the situation of coexistence of multiple communication modes and parallelism of multiple communication bands. Nowadays, under the background of advocating green, energy-saving and environmental protection, people pay more and more attention to how to realize the coexistence of modulation systems with different working modes on the same working platform. As the core module of the transmitter terminal of the wireless communication system, the performance of the power amplifier directly affects the signal transmission quality of the whole communication system. The main work of this paper focuses on the research and design of broadband and high efficiency power amplifiers. Firstly, the basic theoretical knowledge of power amplifiers is introduced, including the classification of power amplifiers, performance parameters, and the core of power amplifier design. Load line theory and load traction technology; then introduces several commonly used broadband power amplifier implementation technology and efficiency enhancement technology, focusing on the power amplifier saturated output and power back two different cases of efficiency enhancement technology comparative study, for the future realization of broadband high-efficiency power amplifier provides a theoretical basis; and then Doherty. The basic principle of power amplifier and its core active load traction theory are studied. The dynamic change process and efficiency characteristics of load impedance under different working conditions of Doherty power amplifier are analyzed. Several new structures of Doherty power amplifier are briefly introduced. In this paper, a simple and practical wide-band DC bias structure is adopted, and the optimal impedance trend of the circuit in the whole working frequency band is determined by the source/load traction simulation, and the impedance trend diagram is drawn. Then the simple matching structure is selected, and the matching network is designed by the Smith circle diagram trajectory method. The wide-band high performance is achieved. The design of efficiency power amplifier is simple and the circuit structure is simple. Then based on broadband high efficiency single-stage power amplifier, a suitable structure of Doherty power amplifier is selected, and a new method of low output impedance matching is proposed. The first step is to simulate and implement a 10W broadband high-efficiency power amplifier. The test results show that the saturated output power of the circuit is between 42-42.5dBm in the operating frequency range of 1.8-2.7GHz, and the additional power efficiency is between 42-42.5dBm in the saturated state. The second step is to design and implement a 20W broadband reverse Doherty power amplifier operating from 1.8 GHz to 2.7 GHz. The test results show that the saturated output power reaches 43.2-45.1 dBm under CW signal and the drain efficiency of the circuit is between 6.7 and 8.6 dB (Pout = 36.5 dBm) when the power falls back. 41.5-45.3%. Using WCDMA signal to drive the power amplifier, the drain efficiency of the circuit is between 45.3 and 48.6% when Pout = 36.5 dBm, and the value of ACPR (Adjacent Channel Power Ratio) is less than - 27.4 dBc when the signal frequency offset is 5 MHz, even up to - 40.3 dBc at 2.1 GHz. The bandwidth is the widest in the existing papers. Secondly, the design is completed for the application of high-power broadband high-efficiency power amplifier. In the first step, the 100W broadband high-efficiency power amplifier is designed and tested. The test results show that the output power of the amplifier is poor except for 2.7GHz (Psat = 47.5dBm) in the operating frequency range of 1.8-2.7GHz. The second step is to design and implement a 200 W broadband reverse Doherty power amplifier operating at 1.8-2.7 GHz. The test results show that the P-3 output power is between 49.3-50.5 dBm and 55.3-65.7% in the whole frequency band. Between 47.5 and 52.93 dBm, the drain efficiency of the circuit is between 34.2% and 45.9% when the power of each frequency point falls back to Pout=46 dBm. The design methods of broadband high-efficiency power amplifier and broadband Doherty power amplifier are analyzed and summarized in this paper. A 10W broadband high-efficiency power amplifier is designed based on GaN HEMT power transistor operating at 1.8-2.7 GHz. Power amplifier, 20W broadband Doherty power amplifier, 100W broadband high efficiency power amplifier and 200W broadband Doherty power amplifier provide practical reference for modern mobile communication.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN722.75
本文編號(hào)：2236239
[Abstract]:With the popularization and application of the third generation (3G) mobile communication technology and the mature development of the fourth generation (4G) mobile communication, the modern mobile communication system presents the situation of coexistence of multiple communication modes and parallelism of multiple communication bands. Nowadays, under the background of advocating green, energy-saving and environmental protection, people pay more and more attention to how to realize the coexistence of modulation systems with different working modes on the same working platform. As the core module of the transmitter terminal of the wireless communication system, the performance of the power amplifier directly affects the signal transmission quality of the whole communication system. The main work of this paper focuses on the research and design of broadband and high efficiency power amplifiers. Firstly, the basic theoretical knowledge of power amplifiers is introduced, including the classification of power amplifiers, performance parameters, and the core of power amplifier design. Load line theory and load traction technology; then introduces several commonly used broadband power amplifier implementation technology and efficiency enhancement technology, focusing on the power amplifier saturated output and power back two different cases of efficiency enhancement technology comparative study, for the future realization of broadband high-efficiency power amplifier provides a theoretical basis; and then Doherty. The basic principle of power amplifier and its core active load traction theory are studied. The dynamic change process and efficiency characteristics of load impedance under different working conditions of Doherty power amplifier are analyzed. Several new structures of Doherty power amplifier are briefly introduced. In this paper, a simple and practical wide-band DC bias structure is adopted, and the optimal impedance trend of the circuit in the whole working frequency band is determined by the source/load traction simulation, and the impedance trend diagram is drawn. Then the simple matching structure is selected, and the matching network is designed by the Smith circle diagram trajectory method. The wide-band high performance is achieved. The design of efficiency power amplifier is simple and the circuit structure is simple. Then based on broadband high efficiency single-stage power amplifier, a suitable structure of Doherty power amplifier is selected, and a new method of low output impedance matching is proposed. The first step is to simulate and implement a 10W broadband high-efficiency power amplifier. The test results show that the saturated output power of the circuit is between 42-42.5dBm in the operating frequency range of 1.8-2.7GHz, and the additional power efficiency is between 42-42.5dBm in the saturated state. The second step is to design and implement a 20W broadband reverse Doherty power amplifier operating from 1.8 GHz to 2.7 GHz. The test results show that the saturated output power reaches 43.2-45.1 dBm under CW signal and the drain efficiency of the circuit is between 6.7 and 8.6 dB (Pout = 36.5 dBm) when the power falls back. 41.5-45.3%. Using WCDMA signal to drive the power amplifier, the drain efficiency of the circuit is between 45.3 and 48.6% when Pout = 36.5 dBm, and the value of ACPR (Adjacent Channel Power Ratio) is less than - 27.4 dBc when the signal frequency offset is 5 MHz, even up to - 40.3 dBc at 2.1 GHz. The bandwidth is the widest in the existing papers. Secondly, the design is completed for the application of high-power broadband high-efficiency power amplifier. In the first step, the 100W broadband high-efficiency power amplifier is designed and tested. The test results show that the output power of the amplifier is poor except for 2.7GHz (Psat = 47.5dBm) in the operating frequency range of 1.8-2.7GHz. The second step is to design and implement a 200 W broadband reverse Doherty power amplifier operating at 1.8-2.7 GHz. The test results show that the P-3 output power is between 49.3-50.5 dBm and 55.3-65.7% in the whole frequency band. Between 47.5 and 52.93 dBm, the drain efficiency of the circuit is between 34.2% and 45.9% when the power of each frequency point falls back to Pout=46 dBm. The design methods of broadband high-efficiency power amplifier and broadband Doherty power amplifier are analyzed and summarized in this paper. A 10W broadband high-efficiency power amplifier is designed based on GaN HEMT power transistor operating at 1.8-2.7 GHz. Power amplifier, 20W broadband Doherty power amplifier, 100W broadband high efficiency power amplifier and 200W broadband Doherty power amplifier provide practical reference for modern mobile communication.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN722.75
【二級(jí)參考文獻(xiàn)】
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