文档名：基于逆全极点滤波器的高频PWM噪声整形方法
摘要：高频开关功率放大器具有高功率、低纹波、高响应的优点,是高加速、高精度定位系统的核心部件.为了解决高频PWM中开关频率与占空比分辨率的矛盾,该文分析调制中噪声整形的基本原理,采用误差反馈结构提取PWM量化噪声进行数字整形,阐述噪声整形滤波器设计约束条件.提出通过逆全极点无限脉冲响应(IIR)滤波器获得有限脉冲响应(FIR)噪声整形滤波器的简明设计方法,仿真及实验表明,该文提出的方法可利用低阶FIR整形滤波器获得平坦的通带和高整形衰减.在不足9位的PWM中,4阶的FIR噪声整形滤波器能够恢复调制信号在10kHz频段内约40dB的信噪比损失.
Abstract：Tokeeptrackoftherequirementsofdrivingthehigh-precisionelectromechanicalsysteminsemiconductormanufacturing,theSNRoftheamplifieroutputcurrentneedstoincreaseby20dBeveryfiveyears.Comparedtolinearpoweramplifiers,switchingpoweramplifiershavesuperiorpotentialinpowerandefficiency.High-frequencyswitchingpoweramplifierscanreducevoltageandcurrentdistortion.However,thelimiteddigitalcomputationcausesaconflictbetweenhighswitchfrequencyandhigh-dutycycleresolution.Therefore,thispaperanalyzesthenoiseshapingprinciplesinthepulse-widthmodulationprocessandproposesasimpledesignmethodforlow-orderFIRnoiseshapingfilters,whichprovidessufficientnoiseattenuationandpassbandflatnesswiththeleastcomputationalcost.Firstly,thesignalprocessinginswitchpoweramplifiersisdemonstrated.QuantizationnoiseindigitalPWMmodulationcausesatrade-offbetweenhighSNRandhighfrequency,assumedtobeuniformlydistributedwhitenoiseandindependentoftheinput.TheimprovementoftheSNRvianoiseshapingisanalyzedaccordingly.Secondly,anerrorfeedbackstructureisusedtoobtainthequantizationnoiseashigh-bitdigitalsignals,separatingthetransmissionoftargetsignalsandquantizationnoiseshapingprocessing.Furthermore,theminimumphaseandstabilityconstraintsofnoise-shapingfiltersarederived.Thirdly,fourdifferenttypesofall-poleIIRfiltersarederivedbytheGegenbauerpolynomial.TheirinverseformsareFIRfilterswiththeorigincutofffrequencyandshapingattenuationaswellastheminimumphaseandcoefficientcharacteristics.Finally,thenoiseattenuationrequirementsaremetbyselectingthefilterorderreasonably.Theinverseall-polefiltermethodreducesthecomplexityofthenoise-shapingfilterdesignandenhancestheabilitytocontroltherippleinthenoise-shapingband.SimulationandexperimenthaveshownthattheproposedmethodachievesalargenoiseattenuationinthesameorderastheLMImethodandhasbetterripplecontrol.WhenPWMmodulatingat200kHzwitharesolutionlowerthan9-bit,a4th-orderFIRnoiseshapingfilterincreasestheSNRofthereferencesignalfrom62.30dBto99.04dBwithinabandwidthof10kHz.Afterthenoiseshaping,thepowerlevelofquantizationnoiseinthetargetfrequencybandreducesfrom-43.12dBto-81.27dB,andthequantizationnoisegeneratedbyPWMhasbeeneliminated.InadditiontotheSNRimprovement,theerrorfeedbackstructurepreservesthephaseandamplitudecharacteristicsofthetargetsignal.Thefollowingconclusionscanbedrawn:(1)Quantizationnoisecanbemodeledasuniformwhitenoiseandextractedthroughanerrorfeedbackstructure,effectivelyseparatingthequantizationnoiseandthecontrolsignalindigitalsignalprocessing.(2)Theinverseall-polefiltermakestheFIRnoiseshapingfilterconformtotheconstraintsofthefirstfixedcoefficientandminimumphase,whichisanexpeditiousmethodforlow-costnoiseshapingdesigninhigh-frequencyPWM.(3)PerformingnoiseshapinginPWMmodulationcanrecoverSNRlosscausedbycoarsequantizationinmodulation,butthebestSNRstilldependsontheanalog-to-digitalconversion.
作者：陈福祥 刘凯 胡傲奇 张昊 赵烁 曾理湛Author：ChenFuxiang LiuKai HuAoqi ZhangHao ZhaoShuo ZengLizhan
作者单位：华中科技大学机械科学与工程学院武汉430074
刊名：电工技术学报 ISTICEIPKU
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(10)
分类号：TM46
关键词：开关功率放大器 高频PWM 噪声整形 全极点滤波器 信噪比
Keywords：Switchmodepoweramplifier highfrequencyPWM noiseshaping all-polefilter signal-to-noiseratio(SNR)
机标分类号：R619.6S663.1TN859
在线出版日期：2024年5月31日
基金项目：国家自然科学基金，国家自然科学基金基于逆全极点滤波器的高频PWM噪声整形方法[
期刊论文] 电工技术学报--2024, 39(10)陈福祥 刘凯 胡傲奇 张昊 赵烁 曾理湛高频开关功率放大器具有高功率、低纹波、高响应的优点,是高加速、高精度定位系统的核心部件.为了解决高频PWM中开关频率与占空比分辨率的矛盾,该文分析调制中噪声整形的基本原理,采用误差反馈结构提取PWM量化噪声进行...参考文献和引证文献
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