1482023RadioEngineeringVol.53No.1doi:10.3969/j.issn.1003-3106.2023.01.019引用格式:李东升,李飞锐.一种新型模拟预失真线性化器[J].无线电工程,2023,53(1):148-154.[LIDongsheng,LIFeirui.ANovelAnalogPredistortionLinearizer[J].RadioEngineering,2023,53(1):148-154.]一种新型模拟预失真线性化器李东升,李飞锐(中国电子科技集团公司第五十四研究所,河北石家庄050081)摘要:为解决氮化镓(GaN)固态功率放大器(Solid-StatePowerAmplifier,SSPA)线性度较差的问题,采用模拟预失真技术设计了一款新型结构的线性化器,将2支肖特基二极管及其管座电路并联,并通过2路偏置电路分别控制,使用微带隔离器减少二极管间的相互干扰,并对输入输出驻波进行改善。通过电路设计软件ADS进行仿真,仿真结果显示,可以实现幅度补偿2.2~6.1dB,相位补偿21.5°~49°。根据测试数据建立功率放大器非线性模型,与线性化器进行级联仿真。结果表明,目标GaNSSPA饱和输出功率回退3dB时,可改善三阶互调10dB以上。进行实物加工及测试,验证了该线性化器可大幅改善功率放大器的线性度。关键词:微波技术;线性化;模拟预失真;固态功率放大器;非线性失真中图分类号:TN802文献标志码:A开放科学(资源服务)标识码(OSID):文章编号:1003-3106(2023)01-0148-07ANovelAnalogPredistortionLinearizerLIDongsheng,LIFeirui(The54thResearchInstituteofCETC,Shijiazhuang050081,China)Abstract:InordertosolvetheproblemofpoorlinearityofGaNSolid-StatePowerAmplifier(SSPA),anovelstructurelinearizerisdesignedbyusinganalogpredistortiontechnology.TwoSchottkydiodesandtheirsocketcircuitsareconnectedinparallelandcontrolledrespectivelybytwobiascircuits.Amicrostripisolatorisusedtoreducethemutualinterferencebetweenthediodesandimprovetheinputandoutputstandingwave.CircuitdesignsoftwareADSisusedforsimulation,andtheresultsshowthattheamplitudecompensationrangeis2.2~6.1dB,andthephasecompensationrangeis21.5°~49°.Accordingtothetestdata,thenonlinearparametermodelofthepoweramplifierisestablishedandtestedincascadewiththelinearizer.TheresultsshowthattheIMD3canbeimprovedbymorethan10dBwhenthesaturatedoutputpowerofthetargetGaNSSPAretreats3dB.Finally,thephysicalprocessingandtestin...