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ID:27867815
大小:4.07 MB
页数:31页
时间:2018-12-06
《电子专业参赛课件 数字电子技术(课件)lec28》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2021/10/4Chapter11IntroductiontoDigitalSignalProcessing1Lecture28Outline11-3ConvertingAnalogSignalstoDigital11-4Analog-to-DigitalConversionMethodsLecture28:Analog-to-DigitalConversion2021/10/4Chapter11IntroductiontoDigitalSignalProcessing2KeyKnowledgeinLecture28Conceptofquantisa
2、tionlevel.Twotypesofquantisationmethods:truncationandroundoff.WorkingprinciplesofthreetypesofADC:theflashADC,dual-slopeADC,andsuccessiveapproximationADC.ADCtestinganderroranalysis.DifficultTopics:1.Dual-slopeADCworkingprinciple.Lecture28:Analog-to-DigitalConversion2021/10/4Chapt
3、er11IntroductiontoDigitalSignalProcessing3SamplingandFilteringLecture28:Analog-to-DigitalConversionBeforesampling,thesignalmustbepassedthroughaanti-aliasingfiltertoeliminatehighfrequencycomponentaboveNyquistfrequency.2021/10/4Chapter11IntroductiontoDigitalSignalProcessing4Bounci
4、ngBallAnalogyofSamplingTheoryLecture28:Analog-to-DigitalConversion2021/10/4Chapter11IntroductiontoDigitalSignalProcessing5ABasicIllustrationoftheConditionfsample<2fa(max)Lecture28:Analog-to-DigitalConversion2021/10/4Chapter11IntroductiontoDigitalSignalProcessing6TheNeedforFilter
5、ingLecture28:Analog-to-DigitalConversionAfterlow-passfiltering,thefrequencyspectraoftheanalogandthesamplingsignalsdonotoverlap,thuseliminatingaliasingerror.2021/10/4Chapter11IntroductiontoDigitalSignalProcessing7IllustrationofaSample-and-HoldOperationLecture28:Analog-to-DigitalC
6、onversion2021/10/4Chapter11IntroductiontoDigitalSignalProcessing8BasicFunctionofanADCConverterLecture28:Analog-to-DigitalConversion2021/10/4Chapter11IntroductiontoDigitalSignalProcessing9QuantizationLecture28:Analog-to-DigitalConversionSample-and-holdoutputwaveformwithfourquanti
7、zationlevels2021/10/4Chapter11IntroductiontoDigitalSignalProcessing10TheReconstructedWaveformLecture28:Analog-to-DigitalConversionusingfourquantizationlevels(2bits)2021/10/4Chapter11IntroductiontoDigitalSignalProcessing11QuantizationLecture28:Analog-to-DigitalConversionSample-an
8、d-holdoutputwaveformwithsixteenquantizationleve
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