标签: 允许

蜂窝无线通信网络呼叫允许控制分析

ATM通信网络基于在线测量的呼叫允许接入控制

铜箔允许通过最大电流DN-71DesignNoteUsingCopperPCBEtchforLowValueResistancebyLarrySpazianiINTRODUCTIONCurrentsensinginpowersuppliesandmotorcontrolsdemandtheuseofaverylowvalueresistor.Eachapplicationvariesinneedforresistancevalue,powerrating,size,formfactor,inductance,temperaturecoefficientandaccuracy.Tomeetsomeoftheseapplications,thecopperofaprintedcircuitboard(PCB)canbeutilized,buthassomedistinctlimitations.ThisdesignnoteprovidesdesignequationsandrecommendationsfordesigningresistorswithPCBcopper.DESIGNOFACOPPERPCBRESISTORTheresistance,asafunctionoftemperature,forapieceofmetal,isgivenbytheequation:R(T)=TheseconstantsapplytothestandardcommerciallyannealedcopperusedinPCBtechnology.Theresi……