北科-数电核心知识点自测卷

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数字电子技术(双语)核心知识点自测题院(系)班级学号姓名1.(15’)AnalyzethecircuitinFigure1.(1)Writetheoutputexpressionforthecircuit.Figure1(2)Developthetruthtableforthecircuit.(3)Minimizethegatesrequiredtoimplementthefunction.2.(10’)ADflip-flopisconnectedasshowninFigure2.DeterminetheQoutputinrelationtotheclockandinputs.Figure2装订线内不得答题自觉遵守考试规则,诚信考试,绝不作弊3.(20’)Implementathreeinputsparitycheckerwithoddparity.Theoutputis“1”whenthenumberofinput“1”isodd.(1)UsingNANDGatesonly(2)Usinga74LS1518-inputsdataselector/multiplexer.4.(10’)Youwishtodetectonlythepresenceofthecodes1110,1001,0101and1011.Anactive-HIGHoutputisrequiredtoindicatetheirpresence.Developthelogiccircuitwithasingleoutputthatwillindicatewhenanyoneofthesecodesisontheinputs.Foranyothercode,theoutputmustbeLOW.Pleaseusea4-line-to-16-linedecoderwithfewergatesasneeded.5.(15’)Showhowtoconnecttwo74LS161sforamodulus-35counterwithsequence(1,2,…35)10.6.(15’)DeterminethesequenceofthecounterinFigure3,showingtheQ1,Q2andQ3waveforms.Figure37.(15’)Designasynchronousbinarycounterwithsequence0001111000,useJKflip-flops.

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