高效寬帶包絡(luò)跟蹤系統(tǒng)電路性能優(yōu)化及非線性行為校正

曹韜; 劉友江; 楊春; 周劼

doi:10.11999/JEIT190275

高效寬帶包絡(luò)跟蹤系統(tǒng)電路性能優(yōu)化及非線性行為校正

doi: 10.11999/JEIT190275

中國工程物理研究院電子工程研究所綿陽 621900

基金項目: 國家自然科學(xué)基金(61601425)

詳細(xì)信息

作者簡介:
曹韜：男，1985年生，副研究員，研究方向為無線測控通信系統(tǒng)設(shè)計技術(shù)

劉友江：男，1986年生，特聘研究員，研究方向為無線測控通信系統(tǒng)設(shè)計技術(shù)

楊春：男，1972年生，研究員，研究方向為無線測控通信系統(tǒng)設(shè)計技術(shù)

周劼：男，1972年生，研究員，研究方向為無線測控通信系統(tǒng)設(shè)計技術(shù)

通訊作者:
曹韜　caotaog@gmail.com

中圖分類號: TN919
計量
- 文章訪問數(shù): 1701
- HTML全文瀏覽量: 1039
- PDF下載量: 52
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2019-04-22
- 修回日期: 2019-11-24
- 網(wǎng)絡(luò)出版日期: 2019-11-30
- 刊出日期: 2020-03-19

Circuits Optimization and System Linearization for High Efficiency and Wideband Envelope Tracking Architecture

Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China

Funds: The National Natural Science Foundation of China (61601425)

摘要

摘要:
為改善包絡(luò)跟蹤(ET)發(fā)射機(jī)帶寬、效率、線性度等指標(biāo)，需優(yōu)化其關(guān)鍵電路性能并校正系統(tǒng)非線性行為。針對該問題，該文構(gòu)建電源調(diào)制器等效模型，推導(dǎo)其效率極值并闡述效率優(yōu)化方法；引入頻率補(bǔ)償網(wǎng)絡(luò)來提升電路帶寬及線性性能；基于系統(tǒng)非線性行為特征，提出包絡(luò)增強(qiáng)型數(shù)字預(yù)失真模型及線性化方案；設(shè)計實際電路并搭建包絡(luò)跟蹤系統(tǒng)。對于S頻段5/10/20 MHz帶寬6.7 dB峰均比測試信號，該系統(tǒng)功放平均效率分別為61%, 54%, 44%，且矢量幅度誤差(EVM)均優(yōu)于1%，具有較好的帶寬、效率、線性度等性能，驗證了電路優(yōu)化方法及非線性行為校正方案的可行性。
- 包絡(luò)調(diào)制器 /
- 包絡(luò)跟蹤 /
- 數(shù)字預(yù)失真 /
- 高效率
Abstract:
To improve bandwidth, efficiency and linearity of Envelope Tracking (ET) architecture, it is necessary to optimize the performance of envelope supply modulator and linearize nonlinear behavior of the ET system. The optimization procedure of the supply modulator is proposed based on the equivalent circuit model. The frequency compensation network is used to improve the bandwidth and linearity of the modulator circuit. An envelope enhanced memory polynomial digital pre-distortion model is introduced to address the nonlinear distortion of the ET system. The practical circuit mentioned above is fabricated and the overall experimental system is set up. Measurement results show that the ET PA at S-band obtains measured efficiency 61%, 54%, 44% and Error Vector Magnitude (EVM) 1% for 6.7 dB PAPR signals with 5 MHz/10 MHz/20 MHz modulation bandwidths, respectively. The ET system exhibits competitive bandwidth, efficiency and linearity, which verifies the proposed optimization and linearization methodology.
- Envelope modulator /
- Envelope Tracking(ET) /
- Digital Pre-Distortion(DPD) /
- High-efficiency

HTML全文

圖 1 混合型EA電路結(jié)構(gòu)

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圖 2 電流采樣信號與開關(guān)波形示意圖

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圖 3 參數(shù)β與h的關(guān)系曲線及不同調(diào)制信號包絡(luò)幅度概率分布

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圖 4 EA平均效率曲面3維視圖及俯視圖

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圖 5 EA線性級反饋網(wǎng)絡(luò)結(jié)構(gòu)圖

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圖 6 頻率補(bǔ)償前后線性級幅頻特性

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圖 7 EA電路實物圖及其平均效率特性

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圖 8 EA電路輸入、輸出包絡(luò)及誤差信號歸一化功率譜

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圖 9 ET測試系統(tǒng)框圖

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圖 10 ET系統(tǒng)關(guān)鍵波形實測圖(局部)

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圖 11 DPD前后ET系統(tǒng)輸出頻譜測試圖(局部)

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表 1 本文EA電路測試結(jié)果與近年文獻(xiàn)結(jié)果對比

文獻(xiàn)/年份	帶寬(MHz)	負(fù)載(Ω)	輸出范圍(V)	輸出功率(W)	效率(%)
文獻(xiàn)[9]/2016	5	—	12.0～27.0	4.0	76.0
文獻(xiàn)[10]/2017	5	—	0～22.5	4.8	73.6
文獻(xiàn)[11]/2017	10	17.5	9.6～26.4	19.4	77.0
文獻(xiàn)[12]/2017	10	6	1.0～2.5	1.0	83.0
文獻(xiàn)[13]/2019	10	8	7.0～27.0	42.5	77.1
本文	40	7.5	2.5～28.0	18.2	81.7

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表 2 ET系統(tǒng)測試結(jié)果

信號帶寬(MHz)	DPD	功率(dBm)	增益(dB)	效率(%)	ACPR1(dBc)	EVM(%)
5	無	34.4	11.0	61.3	-26.7	7.50
5	有	34.4	11.0	60.8	-49.7	0.32
10	無	34.6	11.1	56.7	-26.8	8.10
10	有	34.2	10.7	53.7	-46.3	0.60
20	無	34.3	11.3	46.4	-26.4	8.90
20	有	34.1	11.1	44.1	-46.0	0.67

下載: 導(dǎo)出CSV

參考文獻(xiàn)(16)

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