Thisapplicationreportaddresseshigh-speedsignalssuchas clocksignalsand theirroutingand givesdesignersa reviewof the importantcoherences.Withsomesimpleruleselectromagneticinterferenceproblemscan be minimizedwithoutusingcomplicatedformulasand expensivesimulationtools.Section1givesa shortintroductionto theorywhileSection