标签: iqgain-an

IQGain-AN_924AN-924APPLICATIONNOTEOneTechnologyWayP.O.Box9106Norwood,MA02062-9106,U.S.A.Tel:781.329.4700Fax:781.461.3113www.analog.comDigitalQuadratureModulatorGainbyKenGentileThecarriersignalistimedependentbydefinitionasindicatedbythettermintheargumentsofthesineandcosinefunctions.TheY,I,andQtermshavebeenassignedtargumentsaswell,indicatingthattheirvaluescanalsobetimedependent.Thescalefactorofisaconsequenceofusingthesamenumberofbitsatboththeinputandoutputoftheadder.NotethatthesumofthetwoN-bitmultiplieroutputsactuallyrequiresN+1bitstorepresentthefullrangeofthesummedresults.However,theactofconstrainingtheoutputoftheaddertoonlyNbitsmeansthattheleastsignificantbito……