标签: group

【应用笔记】Altera器件的IEEE1149.1JTAG边界扫描测试(IEEE1149.1JTAGBoundary-ScanTestinginAlteraDevices)当印刷电路板(PCB)变得越来越复杂的时候，全面彻底测试的需求也变得越来越重要呀。Asprintedcircuitboards(PCBs)becomemorecomplex,theneedforthoroughtestingbecomesincreasinglyimportant.AdvancesinsurfacemountpackagingandPCBmanufacturinghaveresultedinsmallerboards,makingtraditionaltestmethods—externaltestprobesand“bedof-nails”testfixtures—hardertoimplement.Asaresult,costsavingsfromPCBspacereductionsaresometimesoffsetbycostincreasesintraditionaltestingmethods.IEEE1149.1JTAGBoundary-ScanTestinginAlteraDevicesJune2005,ver.6.0ApplicationNote39IntroductionAsprintedcircuitboards(PCBs)becomemorecomplex,theneedforthoroughtestingbecomesincreasinglyimportant.Advancesinsurface-mountpackagingandPCBmanufacturinghaveresultedinsmallerboards,makingtraditionaltestmethods―externaltestprobesand“bed-……

Groupdelayhttp://www.microwaves101.com/encyclopedia/whatGroupdelayUpdatedNovember30,2005Here'stheindextoourever-expandingcontentongroupdelay:Groupdelay-whatisit?GroupdelayruleofthumbGroupdelayflatnessandconsistencyGroupdelaydatasmoothing(separatepage)Dispersion(separatepage)Groupdelayinwaveguidestructures(separatepage)Groupdelayinfilters(separatepage)Measuringgroupdelay(separatepage)WantaspreadsheetforcalculatinggroupdelayfromS-parameters?Gotoourdownloadarea,andgetourS-ParameterUtilitiesspreadsheet!Itevensmoothsnoisyphasedata!Groupdelay-whatisit?Groupdelayisameasureofhowlongittakesasignal……

group_delayAppliedRadioLabswww.radiolab.com.auGroupDelayExplanationsandApplicationsDesignFile:DN00415November1999IntroductionGroupdelayisaconceptthatradioengineersareencounteringmorefrequentlyashigherperformancedigitalcommunicationsystemsaredeveloped.Itappearsthatfrequencyselectivecomponentshavegroupdelaywhich,inmostcases,seemstodegradesystemperformance.Thisarticleaddressesseveralaspectsofthistopic:1.Mustwehavegroupdelay?2.Therelationshipbetweengroupdelayandsignaldelay.3.Negativegroupdelay4.Therelationshipbetweengroupdelayandfilterlossinpassivefiltersthatthegroupdelayisinsomewayrelatedtosignaldelay.Thegroupdelaymayalsobereferredtoas“envelopedelay”.TheDelayofSignalsGivenafilter……

2005年ADS论文集锦,asia_user_group_2005_china……