Rail Splitter, from Abraham Lincoln to Virtual Ground

Abstract:Railsplittingiscreatinganartificialvirtualgroundasareferencevoltage.Itisusedtosetthesignaltomatchtheopamp's"sweetspot."Anopamphasthemostlinear-anddistortion-freequalitiesatthatsweetspot.Typically,thesweetspotoccursnearthecenterbetweenthesinglepowerrailandground.Inthecaseofanumberofsignals,thevirtualgroundcancontrolchannelDCerrorswhenmultiplexingorswitchingthesignalsMaxim>AppNotes>AudioCircuitsGeneralEngineeringTopicsPower-SupplyCircuitsKeywords:OpAmps,VirtualGround,RailSplitter,multiplexer,MUX,voltagedivider,sensorconditioning,Dec19,2008precisionresistor,digitalpots,potentiometer,resistance,singlepowersupply,center,matching-bias,reference,channeloffset,settlingtime,errorAPPLICATIONNOTE4344RailSplitter,fromAbrahamLincolntoVirtualGroundBy:BillLaumeisterAbstract:Railsplittingiscreatinganartificialvirtualgroundasareferencevoltage.Itisusedtosetthesignaltomatchtheopamp's"sweetspot."Anopamphasthemostlinear-anddistortion-freequalitiesatthatsweetspot.Typically,thesweetspotoccursnearthecenterbetweenthesinglepowerrailandground.Inthecase