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1、外文文献1原文：DDSdevicestoproducehigh-qualitywaveform:asimple,efficientandflexibleSummaryDirectdigitalfrequencysynthesis(DDS)technologyforthegenerationandregulationofhigh-qualitywaveforms,widelyusedinmedical,industrial,instrumentation,communications,defenseandmanyotherareas.Thisa
2、rticlewillbrieflydescribethetechnology,onitsstrengthsandweaknesses,examinesomeapplicationexamples,andalsointroducedsomenewproductsthatcontributetothepromotionIntroductionAkeyrequirementinmanyindustriesisanexactproduction,easyoperationandquickchangeofdifferentfrequencies,dif
3、ferenttypesofwaveforms.Whetheritisbroadbandtransceiverrequireslowphasenoiseandexcellentspurious-freedynamicperformanceofagilefrequencysource,orforindustrialmeasurementandcontrolsystemneedsastablefrequencyexcitation,fast,easyandeconomicaltoproduceadjustablewaveformwhilemaint
4、ainingphasecontinuitycapabilitiesarecriticaltoadesignstandard,whichiswhattheadvantagesofdirectdigitalfrequencysynthesis.FrequencysynthesistaskThegrowingcongestionofthespectrum,coupledwithlowerpowerconsumption,qualityofnever-endingdemandforhighermeasuringequipment,thesefacto
5、rsrequiretheuseofthenewfrequencyrange,requiresabetteruseofexistingfrequencyrange.Aresult,thesearchforbettercontrol,inmostcases,bymeansoffrequencysynthesizerforfrequencygeneration.Thesedevicesuseagivenfrequency,fCoftogenerateatargetfrequency(andphase)fOUTthegeneralrelationsh
6、ipcanbesimplyexpressedas:fOUT=εx×fCAmongthem,thescalefactorεx,sometimesknownasthenormalizedfrequency.Theequationisusuallygradualapproximationoftherealnumberalgorithms.Whenthescalefactorisarationalnumber,tworelativelyprimenumbers(outputfrequencyandreferencefrequency)thantheh
7、armonic.However,inmostcases,εxmaybelongtoabroadersetofrealnumbers,theapproximationprocessiswithintheacceptablerangewillbetruncatedDirectDigitalFrequencySynthesizerThefrequencysynthesizerapracticalwaytoachieveisthedirectdigitalfrequencysynthesis(ofDDFS),usuallyreferredtoasdi
8、rectdigitalsynthesis(DDS).Thistechniqueusingdigitaldataprocessingtogenerateafreque
