高效宽带包络跟踪系统电路性能优化及非线性行为校正

曹韬; 刘友江; 杨春; 周劼

doi:10.11999/JEIT190275

引用本文: 曹韬, 刘友江, 杨春, 周劼. 高效宽带包络跟踪系统电路性能优化及非线性行为校正[J]. 电子与信息学报, 2020, 42(3): 787-794. doi: 10.11999/JEIT190275 shu

Citation: Tao CAO, Youjiang LIU, Chun YANG, Jie ZHOU. Circuits Optimization and System Linearization for High Efficiency and Wideband Envelope Tracking Architecture[J]. Journal of Electronics and Information Technology, 2020, 42(3): 787-794. doi: 10.11999/JEIT190275 shu

高效宽带包络跟踪系统电路性能优化及非线性行为校正

中国工程物理研究院电子工程研究所绵阳 621900

作者简介: 曹韬: 男，1985年生，副研究员，研究方向为无线测控通信系统设计技术;
刘友江: 男，1986年生，特聘研究员，研究方向为无线测控通信系统设计技术;
杨春: 男，1972年生，研究员，研究方向为无线测控通信系统设计技术;
周劼: 男，1972年生，研究员，研究方向为无线测控通信系统设计技术

通讯作者: 曹韬,caotaog@gmail.com

基金项目: 国家自然科学基金(61601425)

摘要: 为改善包络跟踪(ET)发射机带宽、效率、线性度等指标，需优化其关键电路性能并校正系统非线性行为。针对该问题，该文构建电源调制器等效模型，推导其效率极值并阐述效率优化方法；引入频率补偿网络来提升电路带宽及线性性能；基于系统非线性行为特征，提出包络增强型数字预失真模型及线性化方案；设计实际电路并搭建包络跟踪系统。对于S频段5/10/20 MHz带宽6.7 dB峰均比测试信号，该系统功放平均效率分别为61%, 54%, 44%，且矢量幅度误差(EVM)均优于1%，具有较好的带宽、效率、线性度等性能，验证了电路优化方法及非线性行为校正方案的可行性。

关键词:

English

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

Corresponding author: Tao CAO,caotaog@gmail.com

Received Date: 2019-04-22
Accepted Date: 2019-11-24
Available Online: 2020-03-01
Fund Project: The National Natural Science Foundation of China (61601425)

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.

Key words:

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图 1 混合型EA电路结构

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图 2 电流采样信号与开关波形示意图

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图 3 参数β与h的关系曲线及不同调制信号包络幅度概率分布

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图 4 EA平均效率曲面3维视图及俯视图

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图 5 EA线性级反馈网络结构图

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图 6 频率补偿前后线性级幅频特性

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图 7 EA电路实物图及其平均效率特性

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图 8 EA电路输入、输出包络及误差信号归一化功率谱

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图 9 ET测试系统框图

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图 10 ET系统关键波形实测图(局部)

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图 11 DPD前后ET系统输出频谱测试图(局部)

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表 1 本文EA电路测试结果与近年文献结果对比

文献/年份	带宽(MHz)	负载(Ω)	输出范围(V)	输出功率(W)	效率(%)
文献[9]/2016	5	—	12.0～27.0	4.0	76.0
文献[10]/2017	5	—	0～22.5	4.8	73.6
文献[11]/2017	10	17.5	9.6～26.4	19.4	77.0
文献[12]/2017	10	6	1.0～2.5	1.0	83.0
文献[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系统测试结果

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

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

高效宽带包络跟踪系统电路性能优化及非线性行为校正

通讯作者: 曹韬,caotaog@gmail.com

English

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

Corresponding author: Tao CAO,caotaog@gmail.com

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通讯作者: 陈斌, bchen63@163.com