【MOOC】Analog Electronics Technique-Huazhong University of Science and Technology 中国大学慕课MOOC答案

【MOOC】AnalogElectronicsTechnique-HuazhongUniversityofScienceandTechnology中国大学慕课MOOC答案TestquestionsforTheIdealOperationalAmplifier1、【单选题】Thetwoinputterminalsofanoperationalamplifierarelabeledas:本题答案：【invertingandnoninverting】2、【单选题】ForthecircuitintheFigure,theoutputvoltagevois().本题答案：【-5V】3、【单选题】ForthecircuitinFigure,thecurrentixis()本题答案：【0.5mA】4、【单选题】ForthecircuitinFigure,currentiois()本题答案：【-10μA】5、【单选题】Ifvs=8mV,inthecircuitofFigure,theoutputvoltageis()本题答案：【4mV】6、【单选题】Thepowerabsorbedbythe4kohmresistorinFigureis().本题答案：【4mW】7、【单选题】ForthecircuitinFigure,theoutputvoltagev0is().本题答案：【-3V】8、【单选题】ForthecircuitinFigure,theoutputcurrentiois().本题答案：【-0.2mA】9、【单选题】ForthecircuitinFigure,theoutputvoltagevois().本题答案：【-5V】10、【单选题】ForthecircuitinFigure,theoutputvoltagevois()本题答案：【-8V】11、【单选题】ForthecircuitinFigure,theoutputvoltagevois().本题答案：【-3.8V】12、【单选题】Assumetheoperationalamplifiersareideal,iftheinputvoltageis+1V，Determinevo=().本题答案：【2V】13、【单选题】Assumetheoperationalamplifiersareideal,Determinevo=();本题答案：【0V】14、【单选题】ForthecircuitinFigure,theoutputvoltagevois()本题答案：【350mV】15、【单选题】ForthecircuitinFigure,theoutputvoltagevois()本题答案：【2.4V】16、【单选题】ForthecircuitsshownasFigure,assumetheop-ampsisideal,andthemaximunoutputvoltageofalloftheop-ampsis±13V,whentimeist=0s,givetheinputvoltageisastepinvoltage,andtheamplitudeoftheinputis100mV,whentimeist=1s,determinetheoutputvoltageofeachop-ampis().本题答案：【0V】17、【单选题】ForthecircuitintheFigure,theop-ampsareideal,theinputresistancesofthetwocircuitsare()本题答案：【Ri1Ri2】18、【单选题】AssumealltheOp-Ampsareideal,determinevointermsofviis（）本题答案：【vo=0.5(vi+5)】19、【单选题】Determinethevoltagetransferratiovo/vsinthisop-ampcircuit,whereR=10kohm.本题答案：【-2/3】20、【单选题】AssumealltheOp-Ampsareideal,andwhentimet=0,thecapacitorvoltagevc=0,thenwhent=0,vo1=(),vo2=().本题答案：【vo1=7V,vo2=-2V】21、【单选题】AssumealltheOp-Ampsareideal,andwhentimet=0,thecapacitorvoltagevc=0,thenwhent=(?)s,theoutputvoltagevo=0.本题答案：【1/35】22、【多选题】Foranidealopamp,whichofthefollowingstatementsarenottrue?本题答案：【Thecurrentfromtheoutputterminaliszero#Theinputresistanceiszero】23、【多选题】Differenceamplifiersmaybeusedin().本题答案：【instrumentationamplifiers#subtractingamplifiers】24、【判断题】Inthelinearoperationalamplifierscircuit,theinvertinginputoftheoperationalamplifierisvirtualground.本题答案：【错误】25、【判断题】Thevoltagegainofthevoltagefolloweris1,soitcanbereplacedbyawire.本题答案：【错误】26、【判断题】Inthecaseofopen-loop,theintegratedoperationalamplifiermustworkinthenon-linearregion.本题答案：【正确】27、【填空题】AssumealltheOp-Ampsareideal,determinevois（）V.本题答案：【5】TestquestionsforSemiconductorMaterialsandDiodesCircuits1、【单选题】Atroomtemperature,theconcentrationrelationshipbetweenfreeelectronsandholesinintrinsicsemiconductorsisasfollows（）本题答案：【Same】2、【单选题】Whatarethemajoritycarriersinn-typematerials?本题答案：【freeelectrons】3、【单选题】Whataretheminoritycarriersinp-typematerials?本题答案：【freeelectrons】4、【单选题】AftertheformationofPNjunction,therelationshipbetweendiffusioncurrentanddriftcurrentisasfollows（）本题答案：【Same】5、【单选题】WhenPNjunctionisreversebiased,theresistancebecomes（）本题答案：【larger】6、【单选题】WhenthePNjunctionisforwardbiased,thecurrentismainly（）本题答案：【Forwarddiffusioncurrent】7、【单选题】ForthecircuitshowninFigure，whenVγ=0.7V，thediodevoltageVDandthecurrentIDare（）本题答案：【VD=0.5V,ID=0mA】8、【单选题】WhenthetempertureTincreases，theforwardvoltageofthePNjunction()本题答案：【Decrease】9、【单选题】Theconcentrationofthemajoritycarriersintheextrinsicsemiconductorismainlyaffectedby().本题答案：【Theconcentrationofimpurity】10、【单选题】Theconcentrationoftheminoritycarriersintheextrinsicsemiconductorismainlyaffectedby()本题答案：【Thetemperature】11、【单选题】Thezenerdiodecircuitisshownasfigure,ifVI=10V，R=100ohm，VZ=5V，IZ(min)=5mA，IZ(max)=50mA,T、thenthereisitanceofRLshouldbe()本题答案：【111ohm】12、【单选题】Thecircuitisshownasfigure,andVDD=2V，R=1kohm,vs=50sin(2pi*50t)mV，andVγ=0.7V,thenthequiescentcurrentofthediodeis(),thequiescentvoltageoftheoutputvOis(),andtheacvoltageamplitudeoftheoutputis().本题答案：【1.3mA，1.3V；0.049V】13、【单选题】Thecircuitisshownasfigure,theinputvoltagesareshowninthetable,theoutputvoltageshouldbe()本题答案：【b】14、【单选题】Thecircuitisshownasfigure,thediodesaresilicondiodes,whenvs=6sinwtV,pleaseusethecase1model(Vr=0.7V)toanalysisthecircuit,theoutputwaveformshouldbe()本题答案：【b】15、【单选题】Thecircuitisshownasfigure,iftheRMSvalueoftheacsinesignalis220V,RL=0.1k,weusetheidealmodeltoanalysisthecircuit,thenthepeakinversevoltageofthediodeis().Themaximumrectifiedcurrentofthediodeis().本题答案：【311V，0.99A】16、【单选题】Forthecircuitshownasfigure,ifweuseidealmodel,andtheamplitudeoftheacsinesignalis24V,thenthepeakcurrentofthediodeis(),andthepeakinversevoltageofthediodeis(）本题答案：【120mA，36V】17、【单选题】Thecircuitisshownasfigure,thediodesaresilicondiodes,andVr=0.7V,thediodesD1andD2shouldbe().本题答案：【D1off,D2on】18、【单选题】Thecircuitisshownasfigure,theloadvoltageisVL=9V,aandtheinputvoltagemaybevarybetween11and13.6V,thecurrentoftheloadwillvaryfrom0to100mA,thethemaximumcurrentofthezenerdiodeis()本题答案：【300mA】19、【多选题】Inordertoformn-typesemiconductors,Whatelementscanyouadd()H、As本题答案：【P#As】20、【多选题】Inordertoformp-typesemiconductors,Whatelementscanyouadd()H、As本题答案：【B#Al#Ga】21、【判断题】Fortheactualdiode,aslongasthepositivebiasvoltageisgreaterthanzero,thediodewillturnon.本题答案：【错误】22、【判断题】Whenusingzenerdiodes,currentlimitingresistorsarenotrequired.本题答案：【错误】23、【判断题】Forgeneraldiodes,LEDsandphotodiodes,forwardbiasvoltageisrequiredfornormaloperation.本题答案：【错误】TestquestionsforTheField-EffectTransistor1、【单选题】Forap-channelEnhancement-ModeMOSFET,tocreateaninversionlayer,wemustaddwhatgatetosourcevoltageVGS?本题答案：【Negative】2、【单选题】ThedraincurrentoftheMOSFETisformedbythe(）driftmovement?本题答案：【majoritycarrier】3、【单选题】ThedraincurrentoftheMOSFETiscontrolledbythe（）本题答案：【thegatetosourcevoltageVGS】4、【单选题】Thedraincurrentversusgate-to-sourcevoltagecharacteristicsisshowninFigure,theFETshouldbe().本题答案：【Enhancement-modeNMOSFET】5、【单选题】ForthecircuitsshowninFigure,findwhichcircuitcanworkasanamplifier().本题答案：【D】6、【单选题】Thedraincurrentversusgate-to-sourcevoltagecharacteristicsisshowninFigure，andfortheMOSFET,thevoltageofthethreeterminalsare:VS=-5V,VG=1V,VD=3V,theworkregionofthisMOSFETis().本题答案：【saturation】7、【单选题】ThethresholdvoltageoftheMOSFETinthecircuitisVTN=1V,notconsiderthevoltagedropofthedrainresistor,DeterminetheworkregionoftheMOSFETinthecircuit.（）本题答案：【saturation】8、【单选题】ThethresholdvoltageoftheMOSFETinthecircuitisVTP=-1V,notconsiderthevoltagedropofthedrainresistor,DeterminetheworkregionoftheMOSFETinthecircuit.()本题答案：【cutoff】9、【单选题】InthecircuitinFigure，VGSQ=（）V，ID=（）mA，VDS=()V;本题答案：【VGSQ=2V,IDQ=0.1mA,VDSQ=3V;】10、【单选题】InthecircuitinFigure，theMOSFETworkedinwhichRegion?()本题答案：【saturation】11、【单选题】InthecircuitinFigure，theMOSFETworkedinwhichRegion?()本题答案：【nonsauration】12、【单选题】InthecircuitinFigure，VGSQ=（）V，ID=（）mA，VDS=()V;本题答案：【VGSQ=3V,IDQ=1mA,VDSQ=6V;】13、【单选题】InthecircuitinFigure，VGSQ=（）V，ID=（）mA，VDS=()V;本题答案：【VGSQ=3V,IDQ=1mA,VDSQ=2.5V;】14、【单选题】InthecircuitinFigure，theMOSFETworkedinwhichRegion?()本题答案：【saturation】15、【单选题】InthecircuitinFigure，theMOSFETworkedinwhichRegion?()本题答案：【saturation】16、【单选题】InthecircuitinFigure，VGSQ=（）V，ID=（）mA，VDS=()V;本题答案：【VGSQ=2.2V,IDQ=1mA,VDSQ=7.2V;】17、【多选题】WhichMOSFETscanworkasamplifiersinthefollowingcircuits.本题答案：【B#D】18、【多选题】Thegatesourcevoltageandthedrainsourcevoltageareasfollows,andVTN,VTPorVPN,VPPvaluesarealsoknown.whichMOSFETsworkincutoffregion（）本题答案：【VDS＝3V，VGS＝1V，VTN＝1.5V#VDS＝3V，VGS＝－2V，VTP＝－1V#VDS＝－3V，VGS＝－1V，VTP＝－1.5V】19、【多选题】Thegatesourcevoltageandthedrainsourcevoltageareasfollows,andVTN,VTPorVPN,VPPvaluesarealsoknown.whichMOSFETsworkinsaturationregion（）本题答案：【VDS＝3V，VGS＝2V，VTN＝1V#VDS＝3V，VGS＝－1V，VPN＝－2V#VDS＝－3V，VGS＝－2V，VTP＝－1V】20、【判断题】Forn-channelandp-channelMOSFETs,thedrainsourcevoltageVDScanbepositiveornegativevalue.本题答案：【错误】21、【判断题】Forn-channeldepletion-moseMOSFETs,thegatesourcevoltageVGSmustbepositiveinordertogettheMOSFETsworkinthesaturationregion.本题答案：【错误】22、【判断题】Thethresholdvoltageofp-channelandn-channelenhancement-modeMOSFETsmustbepositive.本题答案：【错误】TestquestionsforBasicFETAmplifiers1、【单选题】AssumingthatthecapacitorsinthecircuitareverylargeandcanberegardedasshortcircuittoACsignal,thesmallsignalequivalentcircuitis（）?本题答案：【】2、【单选题】AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andthecircuitwiththelargestinputresistanceis（）.本题答案：【】3、【单选题】AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuithasthelowestinputresistance（）本题答案：【】4、【单选题】AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuithasthelowestoutputresistance（）本题答案：【】5、【单选题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.ThegmofT1isgm=1mS.DeterminethevoltagegainofthecircuitAv=vo/vi=（）本题答案：【-3.3】6、【单选题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）本题答案：【-3】7、【单选题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）本题答案：【-1】8、【单选题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）本题答案：【-6】9、【单选题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）.本题答案：【-2】10、【单选题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）本题答案：【-3】11、【单选题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）.本题答案：【0.89】12、【多选题】AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuitshaveoutputandinputsignalsinphase（）本题答案：【#】13、【多选题】AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuitshaveoutputandinputsignalsoppositephase（）本题答案：【##】14、【判断题】Inthemultistageamplifiercircuit,theinputresistanceistheinputresistanceofthefirststage,andtheoutputresistanceoftheamplifiercircuitisequaltotheoutputresistanceofthelaststage(outputstage).本题答案：【正确】15、【判断题】Becausethevoltagegainofcommondrainamplifiercircuitislessthan1,itcannotbeusedintheamplifiercircuit本题答案：【错误】16、【判断题】Becausethestructuresofn-channelenhancementMOSFETandp-channelenhancementMOSFETaredifferent,theDCbiasofamplifiercircuitisdifferent,andthesmallmodelusedinACanalysisisalsodifferent.本题答案：【错误】17、【判断题】Thefieldeffecttransistor(FET)worksinthesaturationregionandcanbeusedasanamplifier.TheACamplificationperformanceisindependentoftheDCoperatingpoint.本题答案：【错误】18、【判断题】ThethresholdvoltageandtransconductanceofenhancementMOSFETareconstant.本题答案：【错误】19、【填空题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.ThegmofT1isgm=1mS.Determinetheinputresistanceis（）kohm.本题答案：【2075】20、【填空题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheoutputresistanceis()ohm.本题答案：【500】21、【填空题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheinputresistanceis()ohm.本题答案：【1000】22、【填空题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethesourcevoltagegainofthecircuitAv=vo/vs=().本题答案：【5】23、【填空题】Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheoutputresistanceis()kohm.本题答案：【10】TestquestionsforTheBipolarJunctionTransistor1、【单选题】WhenaBJTtransistorisusedasanamplifyingdevice,thebase-emitterjunctionis()biased,andthebase-collectorjunctionis()biased.本题答案：【Forward,reverse】2、【单选题】FortheimpuritydopingconcentrationsinthethreeregionsoftheBJT,whichregionisthehighest()本题答案：【emitter】3、【单选题】WhenaBJTtransistorworkedinsaturationregion,thebase-emitterjunctionis()biased,andthebase-collectorjunctionis()biased.本题答案：【Forward，forward】4、【单选题】Atransistorisbiasedintheforward-activemode,thecurrentofthethreeterminalsareI1=–1.2mA,I2=–0.03mA,I3=1.23mA，whichoftheseistheemitterterminal()，andwhichoftheseisthebaseterminal()本题答案：【3,2】5、【单选题】InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesinforward-activemode()本题答案：【VC=6V,VB=0.7V,VE=0V】6、【单选题】InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesincutoffregion()（Forsilicontransistor，wethinkVBE（th）=0.5V）本题答案：【VC=6V,VB=4V,VE=3.6V】7、【单选题】Intheamplificationcircuit,theBJTisworkedinforward-activeregion,andthevoltageofeachterminalsisV1=2V,V2=6VandV3=2.7V,forthethreeterminals,whichistheemitter(),thetypeofthistransistoris().本题答案：【1,NPN】8、【单选题】ForthecircuitshowninFigure,whichregiondoesthetransistorworkin()本题答案：【Saturationregion】9、【单选题】ForthecircuitshowninFigure,whichregiondoesthetransistorworkin()本题答案：【Forward-activeregion】10、【单选题】ForthecircuitshowninFigure,whichregiondoesthetransistorworkin()本题答案：【Forward-activeregion】11、【单选题】ForthecircuitshowninFigure,iftheinputsignalisagoodsinusoidalsignal,buttheoutputwaveformisintheFigure16,sothisiswhichdistortion()本题答案：【Saturationregion】12、【单选题】Atransistorisbiasedintheforward-activemode,thecurrentofthethreeterminalsareI1=–1.2mA,I2=–0.03mA,I3=1.23mA，thecurrentgainβis()本题答案：【40】13、【多选题】InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesinsaturationregion()本题答案：【VC=6V,VB=6V,VE=5.4V#VC=3.6V,VB=4V,VE=3.4V】14、【多选题】ForthecircuitshowninFigure,iftheinputsignalisagoodsinusoidalsignal,buttheoutputwaveformisintheFigure,sowhatmeasurescanbetakentoeliminatesuchdistortion()本题答案：【increaseVCCamplitude#reducetheamplitudeofsignalsource#reducethevalueofloadresistanceRL】15、【判断题】IftheemitterandcollectorofBJTtransistorareexchanged,theamplifiercanstillbeconstructed.本题答案：【错误】16、【判断题】WhenNPNtransistorworksintheforwardactiveregion,generallyweaddedpositivepowersupply,butforPNPtransistor,wemustaddnegativepowersupply.本题答案：【错误】17、【填空题】ForthecircuitshowninFigure,theoperationalamplifierisassumedtobeideal,forthetransistorVBE=VB-VE=0.7V,ifthereadingofthevoltmeteris200mV,thenthecurrentgainβofthetransistoris()本题答案：【50】TestquestionsforBasicBJTAmplifiers1、【单选题】ForthecircuitshowninFigure,determinethesmallsignalhybrid-πresistancerπis()andthevoltagegainis（）本题答案：【2.6kohm,-200】2、【单选题】ForallofthecircuitsshowninFigure,whichcircuitcanamplifyACsmallsignal()本题答案：【(b)】3、【单选题】ForthecircuitshowninFigure,whichpositionistheswitchinA,B,C?thetransistorcanworkintheforwardactiveregion()本题答案：【B】4、【单选题】ForthecircuitshowninFigure,ifthetransistorworksintheforwardactiveregion,whichoutputwaveformiscorrect()本题答案：【】5、【单选题】ForthecircuitshowninFigure,ifthetransistorworksintheforwardactiveregion,whichoutputwaveformiscorrect()本题答案：【】6、【单选题】Ifthesourceresistanceofthesignalsourceis1kohm，andwhentheamplifyingcircuitisnotconnected,thevoltageamplitudeofthesignalsourceis10mV，butwhentheamplifyingcircuitisconnected,thevoltageoftheinputportoftheamplifyingcircuitis8mV，thentheinputresistanceoftheamplifyingcircuitis()kohm.本题答案：【4】7、【单选题】Fortheamplifier,whentheloadisopen,theoutputvoltageis4V,andwhenthe3kohmloadresistorisconnected,theoutputvoltageis3V,thentheoutputresistanceoftheamplificationcircuitis()kohm.本题答案：【1】8、【单选题】Fortheamplifier,whentheinputsignalis10pAcurrentandtheoutputis500mVvoltage,theinputresistanceofthisamplifierisbetterifitislargerorsmaller,andthetheoutputresistanceofthisamplifierisbetterifitislargerorsmaller()本题答案：【smaller,smaller】9、【单选题】ForthecircuitshowninFigure，thevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()kohm.本题答案：【-145,0.69,2】10、【单选题】ForthecircuitshowninFigure，thevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()kohm.本题答案：【-87,1.55,3】11、【单选题】ForthecircuitshowninFigure，whenthe50uFcapacitorisopen,thethevoltagegainiswill()andtheinputresistancewill(),outputresisdtancewill().本题答案：【decrease,increase,unchanged】12、【单选题】ForthecircuitshowninFigure，thevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()ohm.本题答案：【0.99,87.2,33】13、【单选题】ForthecircuitshowninFigure，whentheouputvoltageisVo1,thesourcevoltagegainVo1/vsis（）,andtheinputresistanceis()kohm,outputresisdtanceis()ohm.本题答案：【-0.79,8.2,2k】14、【单选题】ForthecircuitshowninFigure，whentheouputvoltageisVo2,thesourcevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()ohm.本题答案：【0.8,8.2,31】15、【单选题】ForthecircuitshowninFigure，thevoltagegainis（）,andtheinputresistanceis()kohm,outputresisdtanceis()ohm.本题答案：【291,0.025,7.5k】16、【单选题】Inthefollowingcircuits,whichcircuithastheleastinputresistance()本题答案：【】17、【单选题】Inthefollowingcircuits,whichcircuithastheleastoutputresistance.()本题答案：【】18、【单选题】Inthefollowingcircuits,whichcircuithasthelargestabsolutegain.()本题答案：【】19、【多选题】ForthecircuitshowninFigure,iftheDCvoltageVCE≈VCC,whatmaybewrongwiththecircuit?本题答案：【ThecapacitorCb1isshort#TheresistorRbisopen#TheresistorRCisshort】20、【多选题】ForthecircuitshowninFigure,ifthetransistorworksintheforwardactiveregion,whichsmallsignalequivalentcircuitiscorrect()本题答案：【#】21、【多选题】WhichofthefollowingamplifyingcircuitsmayamplifythesignalACvoltage()本题答案：【CE#CB#CS#CG】22、【多选题】WhichofthefollowingamplifyingcircuitsmayamplifythesignalACcurrent()本题答案：【CE#CC】23、【多选题】Inthefollowingcircuits,whichcircuitshaveoutputvoltageandinputvoltageinphase.()本题答案：【##】24、【多选题】Inthefollowingcircuits,whichcircuitshaveinverseoutputandinputvoltages.()本题答案：【#】25、【判断题】WhenaBJTtransistorisbiasedintheforward-activemode,theniC=β*iB,sowecanthinkoftransistorsasalwayslineardevices.本题答案：【错误】26、【判断题】UsetheBJT,wecanmagnifyaninputsmallsignaltoalargeoutputsignal,wedon'tneedDCpowersupply.本题答案：【错误】27、【判断题】Aslongasthetransistorworksintheforwardactiveregion,nomatterhowlargetheinputsignalis,linearamplificationcanberealized.本题答案：【错误】28、【判断题】BecauseofthedifferentstructureofNPNandPNP,theDCbiasingisdifferentwhentheyworkinforwardactiveregion,sothesmallsignalmodelisdifferent本题答案：【错误】29、【判断题】Thecapacitorcanbeopenfordc,andcanbeshortforanysignalfrequency.本题答案：【错误】30、【判断题】Theindependentsourcecanalwaysbecomeashortcircuitforacanalysis.本题答案：【错误】31、【判断题】FortheBJT,whentheEarlyvoltageVAisnotinfinite，we’redealingwithsmall-signalamplifiers,wealsosaythatthecollectorcurrentofaBJTinactivemodeisequaltothebasecurrentmultipliedbyβ.本题答案：【错误】32、【判断题】Forthecircuitwithemitterbypasscapacitor,thisbypasscapacitornotonlychangestheQ-point,butalsoaffectsthesmallsignalvoltagegain.本题答案：【错误】33、【判断题】Becausethesmallsignalvoltagegainofthecommoncollectorcircuitislessthan1,ithasnocontributiontosignalamplification.本题答案：【错误】34、【判断题】Thecommoncollectorcircuitcanneitheramplifyvoltagenorcurrent.本题答案：【错误】35、【判断题】ForthecircuitshowninFigure，whethertheoutputvoltagewaveformiscorrect（）本题答案：【错误】TestquestionsforFrequencyResponse1、【单选题】Inasinglestagecommon-emittercircuit,atthecornerfrequencyoffH,thephaseofvoltagegainφ(f)is()degree.本题答案：【-225】2、【单选题】Ifthefrequencyfisnearlyzero,thevoltagegainofthecircuitisequalthepass-bandvoltagegain,thenthecircuitmaybe()本题答案：【low-passfilter】3、【单选题】Considerthecircuitinthefigure,whatisthetimeconstantτassociatedwiththiscircuit?andthiscircuitishigh-passcircuitorlow-passcircuit?本题答案：【0.05s,low-pass】4、【单选题】Considerthecircuitinthefigure,whatisthetimeconstantτassociatedwiththiscircuit?andthiscircuitishigh-passcircuitorlow-passcircuit?本题答案：【0.2s,high-pass】5、【单选题】Themagnitudefrequencyresponseofanamplifiercircuitisshowninthefigure,sotheuppercornerfrequencyis（）,thelowercornerfrequencyis（）,andthepassbandgainis（）.本题答案：【100rad/s，50000rad/s，5】6、【单选题】ThetransferfunctioncorrespondingtotheBodeplotofthemagnitudeshowninfigure,whatistheactualgainat100Hz.本题答案：【57dB】7、【单选题】Inhighfrequencyrange,dropingainiscausedby()本题答案：【transistor'sparasiticcapacitors】8、【单选题】WhenthesignalfrequencyfisequaltothecornerfrequencyfLorfH,thegainis()timesasbigasthemaximummidbandgain.本题答案：【0.707】9、【单选题】Inatwo-stageamplifiercircuit,if20log|AVM1|=40dB,andfL1=4Hz,fH1=20kHz,20log|AVM2|=30dB,fL2=400Hz，fH2=150kHz，theforthetwo-stageamplifier，thetotalvoltagegainis（），andthelowercornerfrequencyis（），theuppercornerfrequencyis（）本题答案：【70dB，400Hz，20kHz】10、【单选题】Considerthecircuitinthefigure,whatisthetimeconstantτassociatedwithCb1?本题答案：【11ms】11、【单选题】Considerthecircuitinthefigure,whatisthetimeconstantτassociatedwithCc?本题答案：【8ms】12、【单选题】AzeroofthetransferfunctionT(s)=10*(s+1)/[(s+2)*(s+3)]isat（）本题答案：【-1】13、【单选题】OntheBodemagnitudeplot,theslopeof1/[(5+jw)(5+jw)]forlargevaluesofwis()本题答案：【-40dB/decade】14、【单选题】Thedifferencebetweenthehalf-powerfrequenciesiscalledthe()本题答案：【bandwidth】15、【多选题】Inlowfrequencyrange,dropingainiscausedby()本题答案：【bypasscapacitors#couplingcapacitors】16、【多选题】Tofindthemaximumgainmagnitudeoftheamplifier()本题答案：【Couplingandbypasscapacitorsactasshorts#transistors'junctioncapacitancesactasopens】17、【多选题】Inordertoreducethelowercornerfrequencyofthecircuitshowninthefigure,andwithoutchangingthepassbandgain,thefollowingmeasurescanbetaken()本题答案：【increaseCb1,Cb2#increaseCe】18、【多选题】ThepolesofthetransferfunctionT(s)=10*(s+1)/[(s+2)*(s+3)]isat（）本题答案：【-2#-3】19、【判断题】ThedifferencebetweendirectcoupledamplifierandRCcoupledamplifieristhatitsgaininlowfrequencyregionwillnotbeattenuated.本题答案：【正确】20、【判断题】Thelowercornerfrequencyoftheamplifiercircuitcanbereducedbyselectingthetransistorwithsmalljunctioncapacitance.本题答案：【错误】21、【判断题】Bandwidthcanbeincreasedbyreducingthegainoftheamplifiercircuit.本题答案：【正确】22、【判断题】Considerthecircuitinthefigure,ifthe50uFbypasscapacitorisconnectedtothecircuit,thenthebandwidthofthisamplifiercanbeincreased.本题答案：【错误】23、【判断题】Generally,thebandwidthofcommongateandcommonbaseamplifieriswiderthanthatofcommonsourceandcommonemitteramplifier.本题答案：【正确】TestquestionsforOutputStagesandPowerAmplifiers1、【单选题】Thereasonforthelowefficiencyofclassaamplifieris（）本题答案：【TheICQquiescentcurrentistoolarge】2、【单选题】Inamultistageamplifier,thepoweramplifierusuallyusedinthe（）stage.本题答案：【outputstage】3、【单选题】Amongthefollowingamplifiers,themosthighefficiencyiswhichcircuit（）本题答案：【classBamplifiers】4、【单选题】IfthemaximumoutputpowerofaclassBpoweramplifieris20W,themaximumpowerofeachpowertransistorshallbeatleast().本题答案：【4W】5、【单选题】Assumethetransistorhaslimitingfactorsof:IC(max)=5A,VCE(max)=30V,andPT(max)=25W,andconsiderthecommon-emittercircuitshowninFigure,ifVCC=24V,thenthemaximuncollectcurrentICM=().本题答案：【5A】6、【单选题】Forthecircuitshowninfigure,theBJTtransistorparametersareVBE(on)=0.7V,VCE(sat)=1V,VA=∞,sothemaximumcollector-emittervoltageis()本题答案：【23V】7、【单选题】Forthecircuitshowninfigure,whentheinputvoltageisnegativehalfcycle,then()本题答案：【T1on，T2off】8、【单选题】ConsiderthecircuitinFigure,forthetransistor,thesaturationvoltageVCES=1V,andtheDCsupplyvoltageisVCC=15V,andtheloadresistanceRL=8ohm,thethemaximumpoweroftheloadmaybe()本题答案：【12.25W】9、【单选题】Forthecircuitshowninfigure,thefunctionofthetwodiodesinthecircuitis()本题答案：【getaconstantDCbiasvoltage】10、【单选题】ForthecircuitshowninFigure,ignoredthesaturationofthetransistor,thenthemaximumpoweroftheloadmaybe().本题答案：【4.5W】11、【单选题】Forthec