数字电子技术(课件)lec01

课程16004735–数字电子技术（I）Instructor授课：胡小平重庆大学通信工程学院CollegeofCommunicationsEngineeringChongqingUniversityBilingualLecturing(双语教学）DigitalElectronics(I)2020/7/6Chapter1DigitalConcepts2TextBook英文改编版数字电子技术（第九版）；电子工业出版社DigitalFundamentals,NinthEditionThomasL.FloydReferenceBook数字电路/逻辑设计；王毓银主编；高等教育出版社数字电路逻辑设计题解；华中科技大学出版社数字电子技术基础；阎石主编；高等教育出版社DigitalElectronics(I)2020/7/6Chapter1DigitalConcepts3CourseGeneralGoal:1.Understandthespecializedknowledgeindigitalelectronics;2.GettoknowsometerminologyinEnglishinthisarea;3.Learnhowtolearn;GeneralStudyGuide:1.Listencarefullyandfollowmylectureclosely;2.Activelyparticipateinclassdiscussion;3.Makeuseofwebresourcesafterclass;4.UseMultisimsoftwareastoolstoverifyyouranswer;CourseGeneralGoalandStudyGuide2020/7/6Chapter1DigitalConcepts4TheCompanionWebsite—On-LineStudy2020/7/6Chapter1DigitalConcepts5GradingPolicyThefinalgradeisbasedonthefollowingitems:1.Classattendanceandparticipation;20%2.Homeworkhand_inandshortquiz;20%3.Multisimsimulation;10%4.Finalexam;50%Specificpolicy:1.Deduct3ptsforeachmissingclass,award1ptsforeachquestionasked;minimumof10questions.2.Therearesomehandcalculatedexercisesaftereachlecture,whichisduewhenanewchapterstarts,plusthreequizzes,worthof10points.3.FiveMultisimsimulationstobefinishedinateamwiththreepeople.2020/7/6Chapter1DigitalConcepts6TheFinalRequirementafterLearningThisCourseGiveyouafunctionaldescription,youshouldbeabletoapplythelogicdesignknowledge,comeupwithanimplementationusingprimitives(基本逻辑器件).TrafficcontroldemosignednumberadditionFollowingaresomeofthedesignexamplesthatyoushouldbeabletocomplete.DigitalclockdemoBinarytoBCDdemo2020/7/6Chapter1DigitalConcepts7Chapter1OutlineLecture1:DigitalconceptsandBasicTermsNewandKeyTermstoBeRememberedAnalog(模拟的);Digital(数字的);Binary(二进制);Bit(二进制数位);Pulse(脉冲);Clock(时钟);Timingdiagram(时序图);Data(数据);Serial(串行);Parallel(并行);Logic(逻辑);1-1DigitalandAnalogQuantities1-2BinaryDigits,LogicLevels,andDigitalWaveforms2020/7/6Chapter1DigitalConcepts8KeyknowledgeinthislectureLecture1:DigitalconceptsandBasicTerms1.Distinguishdigitalandanalogquantities;2.Advantagesofdigitaloveranalog;3.Understandpositiveandnegativelogic;4.Voltagerepresentationoflogiclevel;5.Digitalwaveformparameters;6.Usingdigitalwaveformtocarrybinaryinformation.2020/7/6Chapter1DigitalConcepts9Lecture1:DigitalconceptsandBasicTermsDigitalandAnalogQuantities1.AnalogquantitieshavecontinuousvaluesFigure1–1Graphofananalogquantity(temperatureversustime).2020/7/6Chapter1DigitalConcepts10Lecture1:DigitalconceptsandBasicTermsDigitalandAnalogQuantities2.DigitalquantitieshavediscretesetsofvaluesFigure1–2Sampled-valuerepresentation(quantization)oftheanalogquantityinFigure1–1.Discretequantity:Timeisdiscrete,magnitudeiscontinuous2020/7/6Chapter1DigitalConcepts11TheDigitalAdvantageOverAnalog1.Digitaldatacanbeprocessedandtransmittedmoreefficientlyandreliably.2.Digitaldatahasagreatadvantagetoanalogdatawhenstorageisnecessary.3.Noise(unwantedvoltagefluctuations)doesnotaffectdigitaldatanearlyasmuchasitdoesanalogsignals.Lecture1:DigitalconceptsandBasicTerms2020/7/6Chapter1DigitalConcepts12Lecture1:DigitalconceptsandBasicTermsTypesofElectronicDevicesorInstruments1.AnalogdevicesFigure1–3Abasicaudiopublicaddresssystem.2020/7/6Chapter1DigitalConcepts13Lecture1:DigitalconceptsandBasicTermsTypesofElectronicDevicesorInstruments2.Digitaldevices2020/7/6Chapter1DigitalConcepts14Lecture1:DigitalconceptsandBasicTerms3.CombinationofanaloganddigitaldevicesTypesofElectronicDevicesorInstrumentsFigure1–4BasicblockdiagramofaCDplayer.Onlyonechannelisshown.2020/7/6Chapter1DigitalConcepts15Lecture1:DigitalconceptsandBasicTermsTestYourUnderstanding1.Aquantityhavingcontinuousvaluesisa)adigitalquantityb)ananalogquantityc)abinaryquantityd)anaturalquantityAnswer:b)2.Whichofthefollowingisnotananalogdevice?a)Thermocoupleb)Voltagesensorc)Lightswitchd)AudiomicrophoneAnswer:c)2020/7/6Chapter1DigitalConcepts16Lecture1:DigitalconceptsandBasicTermsBinaryDigits1.Theconventionalnumberingsystemusestendigits:0,1,2,3,4,5,6,7,8,and9.2.Thebinarynumberingsystemusesjusttwodigits:0and1,eachiscalledabit,whichisacontractionofthewordsbinarydigit.3.Thetwobinarydigitsareusedtodesignatelogic0andlogic1.4.Forpositivelogic,0representsLOWand1standsforHIGH.Negativelogicisopposite.2020/7/6Chapter1DigitalConcepts17LogicLevelsLecture1:DigitalconceptsandBasicTermsThevoltagesusedtorepresenta1and0arecalledlogiclevels.Ideally,onevoltagelevelrepresentsaHIGHandanothervoltagelevelrepresentsaLOW.Inapracticaldigitalcircuit,aHIGHcanbeanyvoltagebetweenaspecifiedminvalueandaspecifiedmaxvalue.SoisforLOW.CMOS:2~3.3VCMOS:0~0.8V2020/7/6Chapter1DigitalConcepts18Lecture1:DigitalconceptsandBasicTermsDigitalWaveformsDigitalwaveformsconsistofvoltagelevelsthatarechangingbackandforthbetweentheHIGHandLOWlevelsorstates.Figure1–6Idealpulses.2020/7/6Chapter1DigitalConcepts19Lecture1:DigitalconceptsandBasicTermsMajorPartsofaRealDigitalPulseFigure1–7Nonidealpulsecharacteristics.2020/7/6Chapter1DigitalConcepts20Lecture1:DigitalconceptsandBasicTermsWaveformCharacteristics1.Periodicpu