本文選題：高效率 + 包絡(luò)跟蹤��； 參考：《北京郵電大學(xué)》2015年碩士論文

【摘要】：現(xiàn)代無線通信系統(tǒng)多采用非恒包絡(luò)調(diào)制技術(shù)以提高數(shù)據(jù)傳輸速率,例如OFDM調(diào)制,這使得信號的峰均比較高。傳統(tǒng)功放在放大高峰均比信號時,平均效率較低。Doherty技術(shù)和包絡(luò)跟蹤技術(shù)可以有效地提高功放的平均效率,是目前國內(nèi)外研究的熱門功放效率提升技術(shù)。將這兩種技術(shù)結(jié)合,可以使得功放更高效地放大高峰均比信號。本文主要研究了應(yīng)用于大功率Doherty射頻功放的包絡(luò)跟蹤技術(shù),設(shè)計和實現(xiàn)了一款包絡(luò)跟蹤Doherty功率放大器。本文主要工作包括以下幾個方面： 1.高效、寬帶包絡(luò)放大器的設(shè)計是包絡(luò)跟蹤技術(shù)的重點和難點。當(dāng)今LTE信號的包絡(luò)信號帶寬可達(dá)20MHz,要高效地放大帶寬如此高的包絡(luò)信號對于包絡(luò)放大器的設(shè)計是一大挑戰(zhàn),傳統(tǒng)的線性放大器和開關(guān)變換器無法兼顧效率和帶寬這兩個指標(biāo)。本文設(shè)計的包絡(luò)放大器采用了基于線性部分和開關(guān)部分并聯(lián)的混合型結(jié)構(gòu),以滿足帶寬和效率的要求,并通過對線性部分輸出級電路進(jìn)行改進(jìn),進(jìn)一步提升了包絡(luò)放大器的效率。測試結(jié)果表明,本文設(shè)計的包絡(luò)放大器最大輸出電壓28V,帶寬20MHz,單音信號測試峰值效率76.9%。 2.本文采用了對Doherty功放主功放的漏極電壓進(jìn)行包絡(luò)跟蹤的跟蹤方法,拓寬了傳統(tǒng)兩路對稱Doherty功放的功率回退范圍,提升了Doherty功放放大高峰均比信號時的平均效率。本文對包絡(luò)跟蹤后Doherty功放的效率進(jìn)行了理論推導(dǎo),并使用ADS仿真軟件對包絡(luò)跟蹤Doherty功放進(jìn)行了仿真。仿真結(jié)果顯示應(yīng)用包絡(luò)跟蹤技術(shù)后,Doherty功放在輸出功率回退8dB處,效率提升10%。 3.最后本文在仿真的基礎(chǔ)上完成了包絡(luò)跟蹤Doherty功放的硬件實現(xiàn),并進(jìn)行了單音信號和帶寬信號測試。該Doherty功放峰值輸出功率43dBm,回退6dB處效率43.7%。使用單音信號測試結(jié)果顯示,應(yīng)用包絡(luò)跟蹤技術(shù)后,Doherty功放在輸出功率回退8dB處,效率提升5%。使用帶寬20MHz、PAPR10.18dB的LTE信號測試結(jié)果顯示,應(yīng)用包絡(luò)跟蹤技術(shù)后,Doherty功放在平均輸出功率34.2dBm處,效率提升6.53%。
[Abstract]:In modern wireless communication systems, non-constant envelope modulation technology is used to improve the data transmission rate, such as OFDM modulation, which makes the peak of the signal higher. When the traditional amplifier amplifies the peak to average signal, the average efficiency is low. Doherty technology and envelope tracking technology can effectively improve the average efficiency of the amplifier. It is a hot technology to improve the efficiency of power amplifier at home and abroad. By combining these two techniques, the amplifier can amplify the peak-to-average signal more efficiently. In this paper, the envelope tracking technology for high power Doherty RF power amplifier is studied, and an envelope tracking Doherty power amplifier is designed and implemented. The main work of this paper includes the following aspects: 1. The design of high efficiency and wide band envelop amplifier is the focus and difficulty of envelope tracking technology. Nowadays, the envelope signal bandwidth of LTE signal can reach 20MHz. To amplify the envelope signal with such high bandwidth efficiently is a great challenge to the design of the envelope amplifier. The traditional linear amplifier and switching converter can not take both efficiency and bandwidth into account. The envelope amplifier designed in this paper adopts a hybrid structure based on linear part and switch part in parallel to meet the requirements of bandwidth and efficiency, and improves the output stage circuit of linear part. The efficiency of the envelop amplifier is further improved. The test results show that the designed envelope amplifier has a maximum output voltage of 28V, a bandwidth of 20MHz and a peak efficiency of 76.92. In this paper, the envelope tracking method of the drain voltage of the Doherty power amplifier is adopted, which widens the power back range of the traditional two-channel symmetrical Doherty power amplifier and improves the average efficiency of the amplification peak to average ratio signal of the Doherty amplifier. In this paper, the efficiency of Doherty power amplifier after envelope tracking is deduced theoretically, and the envelope tracking Doherty power amplifier is simulated by ads simulation software. The simulation results show that with the application of envelope tracking technology, the Doherty power amplifier is applied to the output power back 8 dB, and the efficiency is increased by 10. 3%. Finally, the hardware implementation of envelope tracking Doherty power amplifier is completed on the basis of simulation, and the single tone signal and bandwidth signal are tested. The peak output power of the Doherty power amplifier is 43dBm, and the efficiency is 43.7 at 6dB. The results of single-tone signal test show that the envelope tracking technique can be used to amplify the output power at 8 dB, and the efficiency can be improved by 5 dB. The test results of LTE signal with a bandwidth of 20 MHz PAPR 10.18 dB show that the average output power is 34.2dBm and the efficiency is increased 6.53 when the envelope tracking technique is applied.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN722.75

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 ;三元達(dá)推出全球第一款高效Doherty DTV發(fā)射器[J];集成電路應(yīng)用;2010年09期

2 陳新民;宋開宏;廖同慶;;高效率Doherty放大器的設(shè)計與仿真[J];電子測試;2011年07期

3 姚金聰;張光飛;陳俊;;250W三路高功率Doherty放大器的設(shè)計[J];現(xiàn)代電子技術(shù);2012年03期

4 完顏斐俊;;Doherty技術(shù)的應(yīng)用及性能分析[J];電子測量技術(shù);2012年02期

5 張松;柴智;孫健鵬;;煤礦提升機(jī)轉(zhuǎn)動Doherty放大器的改進(jìn)研究[J];煤炭技術(shù);2013年10期

6 方偉;;模擬預(yù)失真與Doherty技術(shù)結(jié)合研究[J];艦船電子對抗;2010年04期

7 陳俊;蘇凱雄;姚金聰;吳怡;;新型三路Doherty功放的設(shè)計[J];微波學(xué)報;2012年04期

8 南敬昌;方楊;李厚儒;;三路Doherty功率放大器的設(shè)計與仿真[J];微電子學(xué)與計算機(jī);2013年01期

9 陳俊;蘇凱雄;姚金聰;;四階Doherty功率放大器效率分析與設(shè)計[J];福州大學(xué)學(xué)報(自然科學(xué)版);2013年06期

10 周蓉蓉;陳智勇;谷亞林;;900MHz Doherty功放的設(shè)計[J];制造業(yè)自動化;2009年12期

相關(guān)會議論文 前4條

1 雷奇;游飛;董磊;何松柏;胡哲彬;劉科江;曹萍;江率;閆彩明;;基于器件功率行為下的寬帶逆置Doherty分析與仿真實現(xiàn)[A];2011年全國微波毫米波會議論文集（下冊）[C];2011年

2 李力力;尉旭波;;基于TD-SCDMA的Doherty高效率功放研究[A];2010中國電子制造技術(shù)論壇論文集[C];2010年

3 曾榮;周R，

本文編號：2018741