4.HIGH SPEED SAMPLING AND HIGH SPEED ADCs

4.HIGH SPEED SAMPLING AND HIGH SPEED ADCs

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時間：2019-07-14

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1、SECTION4HIGHSPEEDSAMPLINGANDHIGHSPEEDADCs,WaltKesterINTRODUCTIONHighspeedADCsareusedinawidevarietyofreal-timeDSPsignal-processingapplications,replacingsystemsthatusedanalogtechniquesalone.Themajorreasonforusingdigitalsignalprocessingare(1)thecostofDSPprocessorshasgonedown,(2)theirspee

2、dandcomputationalpowerhasincreased,and(3)theyarereprogrammable,therebyallowingforsystemperformanceupgradeswithouthardwarechanges.DSPofferssolutionsthatcannotbeachievedintheanalogdomain,i.e.V.32andV.34modems.However,inorderfordigitalsignalprocessingtechniquestobeeffectiveinsolvinganana

3、logsignalprocessingproblem,appropriatecosteffectivehighspeedADCsmustbeavailable.TheADCsmustbetestedandspecifiedinsuchawaythatthedesignengineercanrelatetheADCperformancetospecificsystemrequirements,whichcanbemoredemandingthaniftheywereusedinpurelyanalogsignalprocessingsystems.Inmosthig

4、hspeedsignalprocessingapplications,ACperformanceandwidedynamicrangearemuchmoreimportantthantraditionalDCperformance.ThisrequiresthattheADCmanufacturernotonlydesigntherightADCsbutspecifythemascompletelyaspossibletocoverawidevarietyofapplications.AnotherimportantaspectofintegratingADCsi

5、ntoahighspeedsystemisacompleteunderstandingofthesamplingprocessandthedistortionmechanismswhichultimatelylimitsystemperformance.HighspeedsamplingADCsfirstwereusedininstrumentationandsignalprocessingapplications,wheremuchemphasiswasplacedontime-domainperformance.Whilethisisstillimportan

6、t,applicationsofADCsincommunicationsalsorequirecomprehensivefrequency-domainspecifications.ModernICprocessesalsoallowtheintegrationofmoreanalogfunctionalityintotheADC,suchason-boardreferences,sample-and-holdamplifiers,PGAs,etc.Thismakesthemeasiertouseinasystembyminimizingtheamountofsu

7、pportcircuitryrequired.AnotherdrivingforceinhighspeedADCdevelopmentisthetrendtowardlowerpowerandlowersupplyvoltages.MosthighspeedsamplingADCstodayoperateoneitherdualorsingle5Vsupplies,andthereisincreasinginterestinsingle-supplyconverterswhichwilloperateon3Vorlessforbatterypoweredappli

8、catio

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