结合多项式拟合的功率回退改进方法  

Improved power back-off method combined with polynomial fitting

作　　者：张昕哲 刘成成[1,2] 汪友华[1,2] Zhang Xinzhe;Liu Chengcheng;Wang Youhua(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学省部共建电工装备可靠性与智能化国家重点实验室,天津300130 [2]河北工业大学河北省电磁场与电器可靠性重点实验室,天津300130

出　　处：《电子测量技术》2023年第9期100-107,共8页Electronic Measurement Technology

基　　金：国家自然科学基金(51877065)项目资助。

摘　　要：常用的功率回退法可以在一定程度上改善放大器的非线性问题,但由于该方法的效率较低,因此使用范围存在局限性。本文在功率回退的基础上,提出了一种结合多项式拟合的方法,提升了传统功率回退法6~10 dB的回退范围约束。为了验证组合方法的效果,本文搭建了基于LabVIEW的光电放大测试平台,对不同给定频率下的正弦波、方波以及三角波信号进行信号放大试验。在测试系统放大功能的同时对输出信号进行功率周期图谱分析,能够确定其谐波失真的状态。试验结果表明,改进后的方法降低各谐波分量的功率值相较于功率回退提高了34.6%,证明了该方法对进一步改善放大器非线性问题的有效性。The commonly used Power Back-Off method can improve the nonlinear problem of the amplifier to some extent,but its application scope is limited due to its low efficiency.Based on the Power Back-Off,this paper proposes a method combining polynomial fitting to improve the 6~10 dB backoff range constraint of the traditional Power Back-Off method.In order to verify the effect of the combined method,the photoelectric amplification test platform based on LabVIEW was built in this paper to carry out signal amplification tests on sine wave,square wave and triangle wave signals at different given frequencies.When the amplifying function of the system is tested,the output signal is analyzed by power cycle map,and the harmonic distortion state can be determined.The experimental results show that the improved method can reduce the power value of each harmonic component by 34.6%compared with the Power Back-Off,which proves the effectiveness of the proposed method to further improve the nonlinear problem of the amplifier.

关 键 词：功率放大器 LABVIEW 虚拟仪器 非线性失真 衰减输入 多项式拟合 

分 类 号：TH89[机械工程—仪器科学与技术] TM935[机械工程—精密仪器及机械]