数电双语参考试卷-公开

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1、北京科技大学2008—2009学年第一学期数字电子技术（双语）试卷（A）装订线内不得答题自觉遵守考试规则，诚信考试，绝不作弊院(系)班级学号姓名试卷卷面成绩(占课程考核成绩的70%)平时成绩课程考核成绩题号一二三四五六七小计得分得分一、单项选择（15分）1．Aquantityhavingdiscretevaluesis().(a)adigitalquantity(b)ananalogquantity(c)abinaryquantity(d)anaturalquantity2．Inacertaindigitalwaveform,theperiodistwiceth

2、epulsewidth.Thedutycycleis().(a)100%(b)50%(c)200%3．Thebinarynumber11011101isequaltothedecimalnumber().(a)121(b)221(c)441(d)2564．The1’scomplementof10111001is().(a)01000111(b)01000110(c)11000110(d)101010105．TheoutputofanORgatewithinputsA,BandCisa1(HIGH)when().(a)A=1,B=1,C=1(b)A=0,B=0,C

3、=1(c)A=0,B=0,C=0(b)answers(a),(b),and(c)(e)onlyanswers(a)and(b)6．TheBooleanexpressionis()(a)asumterm(b)aliteralterm(c)aproductterm(d)acomplementedterm7．Thedomainoftheexpressionis().(a)AandD(b)Bonly(c)A,B,CandD(d)noneofthis8．Anexampleofasum-of-productsexpressionis().(a)(b)(c)(d)bothan

4、swers(a)and(b)9．Afull-adderischaracterizedby().(a)twoinputsandtwooutputs(b)threeinputsandtwooutputs(c)twoinputsandthreeoutputs(d)twoinputsandoneoutput数字电子技术（双语）A试卷第8页共8页1．Ifanoctal-to-binarypriorityencoderhasits0,2,5and6inputsattheactivelevel,theactive-HIGHbinaryoutputis().(a)110(b)0

5、10(c)101(d)0002．Theoutputpulsewidthofanonretriggerableone-shotdependson().(a)thetriggerintervals(b)thesupplyvoltage(c)aresistorandcapacitor(d)thethresholdvoltage3．Thepurposeoftheclockinputtoaflip-flopisto().(a)clearthedevice(b)setthedevice(c)alwayscausetheoutputtochangestates(d)cause

6、theoutputtoassumeastatedependentonthecontrolling(S-R,J-KorD)inputs.4．ADRAMmustbe().(a)replaceperiodically(b)refreshedperiodically(c)alwaysenabled(d)programmedbeforeeachuse5．AnDACisa().(a)digital-to-analogcomputer(b)digitalanalysiscalculator(c)dataaccumulationconverter(d)digital-to-an

7、alogconverter6．Thequantizationprocess().(a)convertsthesample-and-holdoutputtobinarycode(b)convertsasampleimpulsetoalevel(c)convertsasequenceofbinarycodestoareconstructedanalogsignal(d)filtersoutunwantedfrequenciesbeforesamplingtakesplace得分一、基本电路分析（40分）1．(10’)Simplifythefollowingexpre

8、ssionsasmuch