标签: select

SelectABitprogram

阐述uClinux串口编程的基本方法；简要介绍操作系统的几种I/O模型，特别对基于select的I/O复用模型在监听多个设备时的适用性进行较详细的分析；比较多个串口下使用轮询方法和使用select机制处理的差别；结合GPSOne与GPS双定位导航系统的实例，给出双串口定位信息接收的软件实现方法。……

Select_right_level_translationApplicationReportSCEA035A-June2004SelectingtheRightLevel-TranslationSolutionPrasadDhondABSTRACTSupplyvoltagescontinuetomigratetolowernodestosupporttoday’slow-power,high-performanceapplications.Whilesomedevicesarecapableofrunningatlowersupplynodes,othersmightnothavethiscapability.Tohaveswitchingcompatibilitybetweenthesedevices,theoutputofeachdrivermustbecompliantwiththeinputofthereceiverthatitisdriving.Thereareseverallevel-translationschemestointerfacethesedeviceswithoneanother.Dependingonapplicationneeds,oneapproachmightbemoresuitablethantheother.Thisapplicationreportgivesanoverviewofthemethodsandproductsusedtotranslatelogiclevelsandliststheadvantagesanddisadvantagesofeach……

MOSFETselect[pic][pic][pic][pic][pic][pic][pic][pic][pic][pic]……

HowtoselectbypassCAPsUltraCADDesign,Inc.ESRandBypassCapacitorSelfResonantBehaviorHowtoSelectBypassCapsDouglasG.Brooks,MS/PhDIntroductionIt’snonewsthatthebandpassrequirementsforpowersystemsonPCB’sareincreasingandthatpowersupplyimpedancerequirementsaregettingtighter.Bypasscapacitorfabricationandassemblytechniquesareimprovingandpushinghigherthenormalself-resonantfrequencieswehavetodealwith.ESR’s(equivalentseriesresistance)aredecreasing,pushingfurtherdownthefloorofthepowersupplyimpedancecurve.Allthishascreatedincreaseddebateastohowtotakeadvantageofthishigherself-resonantrequencyandlowerESR.OneargumentisthatlowerESRisthoroughlybeneficial.Anotheristhat,whilelowerESRlowerstheimpedanceattheminimump……

从理论-经验最全面介绍电容选取的几个文章,capselect……