【MOOC】Analog Electronics Technique-Huazhong University of Science and Technology 中國大學(xué)慕課MOOC答案

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