直接数字频率合成器毕业论文中英文资料外文翻译文献

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1、外文翻译直接数字频率合成器中英文资料外文翻译文献AllAboutDirectDigitalSynthesisByEvaMurphy[eva.murphy@analog.com]ColmSlattery[colm.slattery@analog.com]WhatisDirectDigitalSynthesis?Directdigitalsynthesis(DDS)isamethodofproducingananalogwaveform—usuallyasinewave—bygeneratingatime-varyingsignalindigitalformandthe

2、nperformingadigital-to-analogconversion.BecauseoperationswithinaDDSdeviceareprimarilydigital,itcanofferfastswitchingbetweenoutputfrequencies,finefrequencyresolution,andoperationoverabroadspectrumoffrequencies.Withadvancesindesignandprocesstechnology,today’sDDSdevicesareverycompactanddr

3、awlittlepower.Whywouldoneuseadirectdigitalsynthesizer(DDS)?Aren’tthereothermethodsforeasilygeneratingfrequencies?Theabilitytoaccuratelyproduceandcontrolwaveformsofvariousfrequenciesandprofileshasbecomeakeyrequirementcommontoanumberofindustries.Whetherprovidingagilesourcesoflow-phase-no

4、isevariable-frequencieswithgoodspuriousperformanceforcommunications,orsimplygeneratingafrequencystimulusinindustrialorbiomedicaltestequipmentapplications,convenience,compactness,andlowcostareimportantdesignconsiderations.外文翻译Figure1.TheAD9833-aone-chipwaveformgenerator.Manypossibilitie

5、sforfrequencygenerationareopentoadesigner,rangingfromphase-locked-loop(PLL)-basedtechniquesforveryhigh-frequencysynthesis,todynamicprogrammingofdigital-to-analogconverter(DAC)outputstogeneratearbitrarywaveformsatlowerfrequencies.ButtheDDStechniqueisrapidlygainingacceptanceforsolvingfre

6、quency-(orwaveform)generationrequirementsinbothcommunicationsandindustrialapplicationsbecausesingle-chipICdevicescangenerateprogrammableanalogoutputwaveformssimplyandwithhighresolutionandaccuracy.Furthermore,thecontinualimprovementsinbothprocesstechnologyanddesignhaveresultedincostandp

7、owerconsumptionlevelsthatwerepreviouslyunthinkablylow.Forexample,theAD9833,aDDS-basedprogrammablewaveformgenerator(Figure1),operatingat5.5Vwitha25-MHzclock,consumesamaximumpowerof30milliwatts.WhatarethemainbenefitsofusingaDDS?DDSdevicesliketheAD9833areprogrammedthroughahighspeedseria