标签: scaa059a

scaa059a1AC-CouplingAC-couplingisusedtochangethecommon-modevoltagelevelwheninterconnectingdifferentphysicallayers.AsimpleexampleisshowninFigure1.VOH=1.4VVOL=1VVOH=Vterm+0.2VVOL=Vterm-0.2VVtermFigure1.AC-CouplingtoShiftCommon-ModeVoltageThecapacitorinFigure1removesthedccomponentofthesignal(common-modevoltage),whiletheaccomponent(voltageswing)ispassedon.TheresistortoVterminFigure1representsthebiasingstructureusedtosetthecommon-modevoltageonthereceiversideoftheac-couplingcapacitor.Throughoutthisdocumentthebiasingstructureiseitherpartoftheinternalbiasingofthereceiveroranexternalresistorpullupand/orpulldownnetwork.Inhigh-speedapplications,ac-couplingisonlyrecommendedfor……