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1、外文文献原文：DDSdevicestoproducehigh-qualitywaveform:asimple,efficientandflexibleSummaryDirectdigitalfrequencysynthesis(DDS)technologyforthegenerationandregulationofhigh-qualitywaveforms,widelyusedinmedical,industrial,instrumentation,communications,defenseandmanyotherareas.Thisarticl
2、ewillbrieflydescribethetechnology,onitsstrengthsandweaknesses,examinesomeapplicationexamples,andalsointroducedsomenewproductsthatcontributetothepromotionIntroductionAkeyrequirementinmanyindustriesisanexactproduction,easyoperationandquickchangeofdifferentfrequencies,differenttyp
3、esofwaveforms.Whetheritisbroadbandtransceiverrequireslowphasenoiseandexcellentspurious-freedynamicperformanceofagilefrequencysource,orforindustrialmeasurementandcontrolsystemneedsastablefrequencyexcitation,fast,easyandeconomicaltoproduceadjustablewaveformwhilemaintainingphaseco
4、ntinuitycapabilitiesarecriticaltoadesignstandard,whichiswhattheadvantagesofdirectdigitalfrequencysynthesis.FrequencysynthesistaskThegrowingcongestionofthespectrum,coupledwithlowerpowerconsumption,qualityofnever-endingdemandforhighermeasuringequipment,thesefactorsrequiretheuseof
5、thenewfrequencyrange,requiresabetteruseofexistingfrequencyrange.Aresult,thesearchforbettercontrol,inmostcases,bymeansoffrequencysynthesizerforfrequencygeneration.Thesedevicesuseagivenfrequency,fCoftogenerateatargetfrequency(andphase)fOUTthegeneralrelationshipcanbesimplyexpresse
6、das:fOUT=εx×fCAmongthem,thescalefactorεx,sometimesknownasthenormalizedfrequency.Theequationisusuallygradualapproximationoftherealnumberalgorithms.Whenthescalefactorisarationalnumber,tworelativelyprimenumbers(outputfrequencyandreferencefrequency)thantheharmonic.However,inmostcas
7、es,εxmaybelongtoabroadersetofrealnumbers,theapproximationprocessiswithintheacceptablerangewillbetruncatedDirectDigitalFrequencySynthesizerThefrequencysynthesizerapracticalwaytoachieveisthedirectdigitalfrequencysynthesis(ofDDFS),usuallyreferredtoasdirectdigitalsynthesis(DDS).Thi
8、stechniqueusingdigitaldataprocessingtogenerateafrequen
