包络跟踪芯片应用中查找表的分析与确定

包络跟踪技术作为LTE移动终端发热问题的一种解决方案,在系统应用中需要使用特殊的包络跟踪电源芯片,而这种芯片的使用需要输入包络参考信号。从实际应用角度出发,提出了“固定增益法”这种包络整形的查找表的方法来生成所需的包络参考信号。这种方法兼顾了功率放大器系统的线性度、效率与系统复杂度,极大地提高了系统的稳定性。根据这种方法,确定出了一张查找表。测试结果表明,包络跟踪模式下,PA输出功率可达26d Bm,且使用了包络跟踪技术的射频功率放大器系统对比固定偏置的功率放大器,效率提升了5.1%。...

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Bibliographic Details
Published in电子技术应用 Vol. 41; no. 11; pp. 115 - 117
Main Author 隆万洪 吴振川 徐宽茂 蒋凯旋
Format Journal Article
LanguageChinese
Published 中国科学院上海高等研究院,上海,201210%上海科技大学信息学院,上海,201210 2015
Subjects
包络整形
包络跟踪
包络跟踪电源
查找表
包络整形
envelope tracking
look-up table
包络跟踪
envelope tracking power supply
envelope shaping
查找表
包络跟踪电源
Online AccessGet full text
ISSN0258-7998
DOI10.16157/j.issn.0258-7998.2015.11.032

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Summary:包络跟踪技术作为LTE移动终端发热问题的一种解决方案,在系统应用中需要使用特殊的包络跟踪电源芯片,而这种芯片的使用需要输入包络参考信号。从实际应用角度出发,提出了“固定增益法”这种包络整形的查找表的方法来生成所需的包络参考信号。这种方法兼顾了功率放大器系统的线性度、效率与系统复杂度,极大地提高了系统的稳定性。根据这种方法,确定出了一张查找表。测试结果表明,包络跟踪模式下,PA输出功率可达26d Bm,且使用了包络跟踪技术的射频功率放大器系统对比固定偏置的功率放大器,效率提升了5.1%。
Bibliography:envelope tracking ; envelope tracking power supply ; look-up table ; envelope shaping
11-2305/TN
As a solution for the hate problem of LTE mobile end, envelope tracking technology need a special envelope power sup- ply chip when it applies to mobile communication system and this kind of chip＇s input needs a reference envelope signal. This pa- per gives a so-called Fixed Gain method which combines engineering design with practical tuning. This method is mainly for gener- ating a look-up table of envelope tracking technology. Linearity, efficiency and complexity of the system are considered in this method. This greatly improves the robustness of the system. A look-up table is created based on this method. The testing result re- veals that the efficiency of a power amplifier system can be improved by 5.1% with this method and related look-up table, the output power of the power amplifier reaches 26 dBm compared with the one having the same output power but fixed bias.
Long Wanhong, Wu Zhenchuan, Xu Kuanmao, Jiang K
ISSN:0258-7998
DOI:10.16157/j.issn.0258-7998.2015.11.032