Modulated rapid load pull system for the emulation of envelope tracking power amplifiers

Modulated rapid load pull system for the emulation of envelope tracking power amplifiers
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用于仿真包络跟踪功率放大器的调制快速负载牵引系统

DOI:
10.1049/el.2019.3896
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发表时间:
2020
影响因子:
1.1
通讯作者:
Alsahali S
Alsahali S
中科院分区:
工程技术4区
文献类型:
--
作者:
Alsahali S

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这封信介绍了一种新颖的特性系统,能够完全模拟完整的包络跟踪功率放大器(ET-PA)环境,具有调制阻抗合成和动态电源电压生成功能,同时使用行业标准调制信号和数字预失真。该系统用于对10 W GaN器件进行封装,并提供对信号和失真带宽的阻抗控制,以响应10 MHz长期演进信号。利用基于National Instruments PXI的测量系统将跟踪信号应用于定制电源调制器,并成功将平均功率增加效率提高了1.18个百分点。实现了三种不同的整形函数,并对其效率和线性性能进行了评估。此外,数字预失真(DPD)用于线性化PA,同时以三种不同的跟踪轨迹运行。实验结果表明,当应用整形函数时,需要在效率和线性度之间进行权衡。即使恒定增益整形函数提供较低的效率,它也可以在没有DPD的情况下实现良好的原始线性度性能,如果局部线性化不可用,这是一个很好的选择。这种新型系统是ET-PA设计中的有用工具,可以更全面地研究设备的性能。
This Letter presents a novel characterisation system that is able to fully emulate a complete envelope tracking power amplifier (ET‐PA) environment, with modulated impedance synthesis and dynamic supply voltage generation while using industry‐standard modulated signals and digital pre‐distortion. The system is used to characterise a 10 W GaN device and provide impedance control over the signal and distortion bandwidths, in response to a 10 MHz long‐term evolution signal. A National Instruments PXI‐based measurement system is utilised to apply tracking signals to a bespoke supply modulator and successfully improve the average power added efficiency by ∼18 percentage points. Three different shaping functions are implemented, and their efficiency and linearity performance evaluated. In addition, digital pre‐distortion (DPD) is used to linearise the PA while operating with the three different tracking trajectories. Experimental results demonstrate that when applying shaping functions, a trade‐off needs to be made between efficiency and linearity. Even though a constant gain shaping function provides lower efficiency, it achieves good raw linearity performance without DPD, which is a good option if local linearisation is not available. This novel system is a useful tool in the design of ET‐PAs, to more completely investigate the performance of the device.
了解包络跟踪功率放大器并对其进行表征
DOI: --
发表时间: 2019
期刊:
影响因子: --
作者:
G. Wimpenny
通讯作者: G. Wimpenny
用于包络跟踪功率放大器的 GaN HEMT 中增益随电源电压变化的变化分析
DOI: 10.1109/tmtt.2019.2916404
发表时间: 2019
影响因子: 4.3
作者:
Alt A
通讯作者: Alt A
具有功率跟踪功能的高效多信号 2–4GHz 功率放大器
DOI: --
发表时间: 2018
影响因子: 4.3
作者:
M. Duffy;G. Lasser;M. Olavsbråten;E. Berry;Z. Popovic
通讯作者: Z. Popovic