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    2016-2-21 23:19
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    敬请点击如下链接,或者通过微信搜索个人公众号:InterCar,或者微信号:CarRadio_engineering来订阅个人公众号,谢谢关注! http://mp.weixin.qq.com/s?__biz=MzIwMDU5MzY5NA==mid=402622124idx=1sn=0398ffcec3b8b5971c6f8554fa0223cb#rd
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    IPC-A-600K:2020-AcceptabilityofPrintedBoardsThedefinitiveillustratedguidetoprintedboardacceptability!Thisfour-colordocumentprovidesphotographsandillustrationsofthetarget,acceptableandnonconformingconditionsthatareeitherinternallyorexternallyobservableonbareprintedboards.Makesureyouroperators,inspectors,andengineershavethemostcurrentindustryconsensusinformation.With120neworrevisedphotographsandillustrations,revisionKprovidesnewcoverageontopicssuchasmicroviacontactdimensions,plating,voidingandfill,alongwithupdatedandexpandedcoveragefordielectricremoval(etchback,smearandwicking),platingfolds,surfaceplatingforedgeconnectors,SMTandBGApads,marking,holeregistration,delamination,capplating,viafillandflexiblecircuits.ThedocumentsynchronizestotheacceptabilityrequirementsexpressedinIPC-6012EandIPC-6013D.SupersedesIPC-A-600J.194992286@qq.com
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    Abstract:Engineersoftenwishthatradiosusceptibility(RS)orradioimmunitycouldbecuredwithanantibiotic,avaccine,orsomeformofcure-all.Unfortunately,solvingtheRSproblemisnotthateasy.Indeed,thelawsofphysicsapply.InthisarticlewediscusssourcesofRS.Wealsooffertipsandhintstoprotectsystems,powersupplies,printedcircuitboards(PCBs),andelectroniccomponentsfromradiofrequencyinterference.Maxim>DesignSupport>TechnicalDocuments>Tutorials>A/DandD/AConversion/SamplingCircuits>APP5065Maxim>DesignSupport>TechnicalDocuments>Tutorials>AmplifierandComparatorCircuits>APP5065Maxim>DesignSupport>TechnicalDocuments>Tutorials>CommunicationsCircuits>APP5065Keywords:radiosusceptibility,powersupplies,grounding,printedcircuitboard,electroniccomponents,radiofrequencyinterference,radioimmunity,electromagneticfield,EMI,RFI,jittertransitions,IntegratedfilterIC,inputoutputports,powerline,RSJan03,2012TUTORIAL5065RadioSusceptibility―CurewithAntibiotic,Vaccine,ortheLawsofPhysics……
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    摘要:工程师常常想,无线电易感性(RS)或无线电干扰,可以用抗生素,疫苗,或某种形式包治百病治愈。不幸的是,解决了RS问题并不那么容易。事实上,物理定律的适用。在这篇文章中,我们讨论了RS的来源。我们还提供技巧和提示,以保护系统,电源供应器,印刷电路板(PCB),电子元器件,无线电频率干扰。Maxim>DesignSupport>TechnicalDocuments>Tutorials>A/DandD/AConversion/SamplingCircuits>APP5065Maxim>DesignSupport>TechnicalDocuments>Tutorials>AmplifierandComparatorCircuits>APP5065Maxim>DesignSupport>TechnicalDocuments>Tutorials>CommunicationsCircuits>APP5065Keywords:radiosusceptibility,powersupplies,grounding,printedcircuitboard,electroniccomponents,radiofrequencyinterference,radioimmunity,electromagneticfield,EMI,RFI,jittertransitions,IntegratedfilterIC,inputoutputports,powerline,RSJan03,2012TUTORIAL5065RadioSusceptibility―CurewithAntibiotic,Vaccine,ortheLawsofPhysics……
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    ADI_High_Speed_Printed_Circuit_Board高速PCB布线实践指南作者:JohnArdizzoni虽然印制电路板(PCB)布线在高速电路中具有关键的作用,但它往往是电路设计过程的最后几个步骤之一。高速PCB布线有很多方面的问题,关于这个题目已有人撰写了大量的文献。本文主要从实践的角度来探讨高速电路的布线问题。主要目的在于帮助新用户当设计高速电路PCB布线时对需要考虑的多种不同问题引起注意。另一个目的是为已经有一段时间没接触PCB布线的客户提供一种复习资料。由于版面有限,本文不可能详细地论述所有的问题,但是我们将讨论对提高电路性能、缩短设计时间、节省修改时间具有最大成效的关键部分。虽然这里主要针对与高速运算放大器有关的电路,但是这里所讨论的问题和方法对用于大多数其它高速模拟电路的布线是普遍适用的。当运算放大器工作在很高的射频(RF)频段时,电路的性能很大程度上取决于PCB布线。“图纸”上看起来很好的高性能电路设计,如果由于布线时粗心马虎受到影响,最后只能得到普通的性能。在整个布线过程中预先考虑并注意重要的细节会有助于确保预期的电路性能。厚,有多少层,各信号层和接地平面的详细信息――功耗、地模拟信号、数字信号和RF信号);各层需要那些信号;要求重要元件的放置位置;旁路元件的确切位置;哪些印制线很重要;哪些线路需要控制阻抗印制线;哪些线路需要匹配长度;元件的尺寸;哪些印制线需要彼此远离(或靠近);哪些线路需要彼此远离(或靠近);哪些元器件需要彼此远离(或靠近);哪些元器件要放在PCB的上面,哪些放在下面。永远不要抱怨需要给别人的信息太多――太少吗?是;太多吗?不。一条学习经验:大约10年前,我设计一块多层的表面贴电路板――板子的两面都有元件。用很多螺钉将板子固定在一个镀金的铝制外壳中(因为有很严格的防震指标)。提……
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