本文選題：高效率 + 包絡跟蹤　； 參考：《北京郵電大學》2015年碩士論文

【摘要】：現代無線通信系統多采用非恒包絡調制技術以提高數據傳輸速率,例如OFDM調制,這使得信號的峰均比較高。傳統功放在放大高峰均比信號時,平均效率較低。Doherty技術和包絡跟蹤技術可以有效地提高功放的平均效率,是目前國內外研究的熱門功放效率提升技術。將這兩種技術結合,可以使得功放更高效地放大高峰均比信號。本文主要研究了應用于大功率Doherty射頻功放的包絡跟蹤技術,設計和實現了一款包絡跟蹤Doherty功率放大器。本文主要工作包括以下幾個方面： 1.高效、寬帶包絡放大器的設計是包絡跟蹤技術的重點和難點。當今LTE信號的包絡信號帶寬可達20MHz,要高效地放大帶寬如此高的包絡信號對于包絡放大器的設計是一大挑戰(zhàn),傳統的線性放大器和開關變換器無法兼顧效率和帶寬這兩個指標。本文設計的包絡放大器采用了基于線性部分和開關部分并聯的混合型結構,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行改進,進一步提升了包絡放大器的效率。測試結果表明,本文設計的包絡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行包絡跟蹤的跟蹤方法,拓寬了傳統兩路對稱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。本文對包絡跟蹤后Doherty功放的效率進行了理論推導,并使用ADS仿真軟件對包絡跟蹤Doherty功放進行了仿真。仿真結果顯示應用包絡跟蹤技術后,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上完成了包絡跟蹤Doherty功放的硬件實現,并進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果顯示,應用包絡跟蹤技術后,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信號測試結果顯示,應用包絡跟蹤技術后,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

【相似文獻】

相關期刊論文 前10條

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

2 陳新民;宋開宏;廖同慶;;高效率Doherty放大器的設計與仿真[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放大器的設計[J];現代電子技術;2012年03期

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

5 張松;柴智;孫健鵬;;煤礦提升機轉動Doherty放大器的改進研究[J];煤炭技術;2013年10期

6 方偉;;模擬預失真與Doherty技術結合研究[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功放的設計[J];微波學報;2012年04期

8 南敬昌;方楊;李厚儒;;三路Doherty功率放大器的設計與仿真[J];微電子學與計算機;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計[J];福州大學學報(自然科學版);2013年06期

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

相關會議論文 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[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中國電子制造技術論壇論文集[C];2010年

3 曾榮;周R，

本文編號：2018741