titleAnalogElectronicsTechnique(HuazhongUniversityofScienceandTechnology)1465111447中國大學(xué)mooc答案100分最新版contentLecture1TheIdealOperationalAmplifierTestquestionsforTheIdealOperationalAmplifier1、Thetwoinputterminalsofanoperationalamplifierarelabeledas:答案:invertingandnoninverting2、Forthecircuitin

theFigure,theoutputvoltagevois(

).答案:-5V3、ForthecircuitinFigure,thecurrentixis(

)答案:0.5mA4、ForthecircuitinFigure,currentiois(

)答案:-10μA5、Ifvs=8mV,inthecircuitofFigure,theoutputvoltageis(

)答案:4mV6、Thepowerabsorbedbythe4kohmresistorinFigureis(

).答案:4mW7、ForthecircuitinFigure,theoutputvoltagev0is(

).答案:-3V8、ForthecircuitinFigure,theoutputcurrentiois(

).答案:-0.2mA9、ForthecircuitinFigure,theoutputvoltagevois(

).答案:-5V10、ForthecircuitinFigure,theoutputvoltagevois(

)答案:-8V11、ForthecircuitinFigure,theoutputvoltagevois

(

).答案:-3.8V12、Assumetheoperationalamplifiersareideal,iftheinputvoltageis+1V，Determinevo=(

).答案:2V13、Assumetheoperationalamplifiersareideal,Determinevo=(

);答案:0V14、ForthecircuitinFigure,theoutputvoltagevois(

)答案:350mV15、ForthecircuitinFigure,theoutputvoltagevois(

)答案:2.4V16、ForthecircuitsshownasFigure,assumetheop-ampsisideal,andthemaximunoutputvoltageofalloftheop-ampsis±13V,whentimeist=0s,givetheinputvoltageisastepinvoltage,andtheamplitudeoftheinputis100mV,whentimeist=1s,determinetheoutputvoltageofeachop-ampis(

).答案:0V17、ForthecircuitintheFigure,theop-ampsareideal,theinput

resistancesofthetwocircuitsare(

)答案:Ri1<Ri218、Assume

alltheOp-Ampsareideal,determinevointermsofviis

（

）答案:vo=0.5(vi+5)19、Determinethevoltagetransferratiovo/vsinthisop-ampcircuit,whereR=10kohm.答案:-2/320、Assume

alltheOp-Ampsareideal,andwhentimet=0,thecapacitorvoltagevc=0,thenwhent=0,vo1=(

),vo2=(

).答案:vo1=7V,vo2=-2V21、Assume

alltheOp-Ampsareideal,andwhentimet=0,thecapacitorvoltagevc=0,thenwhen

t=(?)s,

theoutputvoltagevo=0.答案:1/3522、Foranidealopamp,whichofthefollowingstatementsarenottrue?答案:Thecurrentfromtheoutputterminaliszero;

Theinputresistanceiszero23、Differenceamplifiersmaybeusedin(

).答案:instrumentationamplifiers;

subtractingamplifiers24、Inthelinearoperationalamplifierscircuit,theinvertinginputoftheoperationalamplifierisvirtualground.答案:錯誤

分析：onlyininvertingamplifiersisvirtualground,inthenoninvertingamplifiersnotlikethis.25、Thevoltagegainofthevoltagefolloweris1,soitcanbereplacedbyawire.答案:錯誤

分析：thevoltagefollowercaneliminateloadingeffect,notlikethewire.26、Inthecaseofopen-loop,theintegratedoperationalamplifiermustworkinthenon-linearregion.答案:正確

分析：Becausethevoltagegainoftheop-ampisveryverylarge,soifnonegativefeedback,theop-ampcannotworkinlinearregion.27、Assume

alltheOp-Ampsareideal,determinevois

（

）V.

答案:5

分析：youcanunderstandthisquestionwithsuperposition,whenv3issettozero,youcanfindvo1=-30k/30k(-3V)+(-30k/30k)4V=1V,thensetv1=v2=0,andthecircuitisnoninvetingamp.theoutputis3V[30/(30+15)]

(1+30/(30||30)=2V*3=6V,thenoutputis6-1=5V.Lecture2SemiconductorMaterialsandDiodesCircuitsTestquestionsforSemiconductorMaterialsand1、Atroomtemperature,theconcentrationrelationshipbetweenfreeelectronsandholesinintrinsicsemiconductorsisasfollows（

）答案:Same2、Whatarethemajoritycarriersinn-typematerials?答案:freeelectrons3、Whataretheminoritycarriersinp-typematerials?答案:freeelectrons4、AftertheformationofPNjunction,therelationshipbetweendiffusioncurrentanddriftcurrentisasfollows（

）答案:Same5、WhenPNjunctionisreversebiased,theresistancebecomes

（

）答案:larger6、WhenthePNjunctionisforwardbiased,thecurrentis

mainly（

）答案:Forwarddiffusioncurrent7、ForthecircuitshowninFigure，whenVγ=0.7V，thediodevoltageVDandthecurrentIDare（

）答案:VD=0.5V,ID=0mA8、WhenthetempertureTincreases，theforwardvoltageofthePNjunction(

)答案:Decrease9、Theconcentrationofthemajoritycarriersintheextrinsicsemiconductorismainlyaffectedby(

).答案:Theconcentrationofimpurity10、Theconcentrationoftheminoritycarriersintheextrinsicsemiconductorismainlyaffectedby(

)答案:Thetemperature11、Thezenerdiodecircuitisshownasfigure,ifVI=10V，R=100ohm，VZ=5V，IZ(min)=5mA，IZ(max)=50mA,T、thenthereisitanceofRLshouldbe

(

)答案:>111ohm12、Thecircuitisshownasfigure,andVDD=2V，R=1kohm,vs=50sin(2pi*50t)mV，andVγ=0.7V,thenthequiescentcurrentofthediodeis(

),thequiescentvoltageoftheoutputvOis

(

),andtheacvoltageamplitudeoftheoutputis(

).答案:1.3mA，1.3V；0.049V13、Thecircuitisshownasfigure,theinputvoltagesareshowninthetable,theoutputvoltageshouldbe(

)答案:b14、Thecircuitisshownasfigure,thediodesaresilicondiodes,whenvs=6sinwtV,pleaseusethecase1model(Vr=0.7V)toanalysisthecircuit,theoutputwaveformshouldbe(

)

答案:b15、Thecircuitisshownasfigure,iftheRMSvalueoftheacsinesignalis220V,RL=0.1k,weusetheidealmodeltoanalysisthecircuit,thenthepeakinversevoltageofthediodeis(

).The

maximumrectifiedcurrentofthediodeis(

).答案:311V，0.99A16、Forthecircuitshownasfigure,ifweuseidealmodel,andtheamplitudeoftheacsinesignalis24V,thenthepeakcurrentofthediodeis(

),andthepeakinversevoltageofthediodeis(

）答案:120mA，36V17、Thecircuitisshownasfigure,thediodesaresilicondiodes,andVr=0.7V,thediodesD1andD2shouldbe(

).

答案:

D1off,D2on18、Thecircuitisshownasfigure,theloadvoltageisVL=9V,aandtheinputvoltagemaybevarybetween11and13.6V,thecurrentoftheloadwillvaryfrom0to100mA,thethemaximumcurrentofthezenerdiodeis(

)答案:300mA19、Inordertoformn-typesemiconductors,Whatelementscanyouadd(

)答案:P;

As20、Inordertoformp-typesemiconductors,Whatelementscanyouadd(

)答案:B;

Al;

Ga21、Fortheactualdiode,aslongasthepositivebiasvoltageisgreaterthanzero,thediodewillturnon.答案:錯誤

分析：mustgreaterthanturnonvoltage.22、Whenusingzenerdiodes,currentlimitingresistorsarenotrequired.答案:錯誤

分析：mustneedthisresistortoadjustvoltage.23、Forgeneraldiodes,LEDsandphotodiodes,forwardbiasvoltageisrequiredfornormaloperation.答案:錯誤

分析：photoiodesusuallyisreversebiased.Lecture3TheField-EffectTransistorTestquestionsforTheField-EffectTransistor1、Forap-channelEnhancement-ModeMOSFET,tocreateaninversionlayer,wemustaddwhatgateto

sourcevoltageVGS?

答案:Negative2、Thedraincurrent

oftheMOSFETisformedbythe(

）driftmovement?答案:majoritycarrier3、Thedraincurrent

oftheMOSFETiscontrolledbythe（

）答案:thegatetosourcevoltageVGS4、Thedraincurrentversusgate-to-sourcevoltagecharacteristicsisshowninFigure,theFETshouldbe(

).答案:Enhancement-modeNMOSFET5、ForthecircuitsshowninFigure,findwhichcircuitcanworkasanamplifier(

).答案:D6、Thedraincurrentversusgate-to-sourcevoltagecharacteristicsisshowninFigure，andfortheMOSFET,thevoltageofthethreeterminalsare:VS=-5V,VG=1V,VD=3V,theworkregionofthisMOSFETis(

).答案:saturation7、ThethresholdvoltageoftheMOSFETinthecircuitisVTN=1V,notconsiderthevoltagedropofthedrainresistor,DeterminetheworkregionoftheMOSFETinthecircuit.（

）答案:saturation8、ThethresholdvoltageoftheMOSFETinthecircuitisVTP=-1V,notconsiderthevoltagedropofthedrainresistor,DeterminetheworkregionoftheMOSFETinthecircuit.(

)答案:cutoff9、InthecircuitinFigure，VGSQ=（

）V，ID=（

）mA，VDS=(

)V;答案:VGSQ=2V,IDQ=0.1mA,VDSQ=3V;10、InthecircuitinFigure，theMOSFETworkedinwhichRegion?(

)答案:saturation11、InthecircuitinFigure，theMOSFETworkedinwhichRegion?(

)答案:nonsauration12、InthecircuitinFigure，VGSQ=（

）V，ID=（

）mA，VDS=(

)V;答案:VGSQ=3V,IDQ=1mA,VDSQ=6V;13、InthecircuitinFigure，VGSQ=（

）V，ID=（

）mA，VDS=(

)V;答案:VGSQ=3V,IDQ=1mA,VDSQ=2.5V;14、InthecircuitinFigure，theMOSFETworkedinwhichRegion?(

)答案:saturation15、InthecircuitinFigure，theMOSFETworkedinwhichRegion?(

)答案:saturation16、InthecircuitinFigure，VGSQ=（

）V，ID=（

）mA，VDS=(

)V;答案:VGSQ=2.2V,IDQ=1mA,VDSQ=7.2V;17、WhichMOSFETscanworkasamplifiersinthefollowingcircuits.答案:B;

D18、Thegatesourcevoltageandthedrainsourcevoltageareasfollows,and

VTN,VTPorVPN,VPPvaluesarealsoknown.whichMOSFETsworkincutoffregion（

）答案:VDS＝3V，VGS＝1V，VTN＝1.5V;

VDS＝3V，VGS＝－2V，VTP＝－1V;

VDS＝－3V，VGS＝－1V，VTP＝－1.5V19、Thegatesourcevoltageandthedrainsourcevoltageareasfollows,and

VTN,VTPorVPN,VPPvaluesarealsoknown.whichMOSFETsworkinsaturationregion（

）答案:VDS＝3V，VGS＝2V，VTN＝1V;

VDS＝3V，VGS＝－1V，VPN＝－2V;

VDS＝－3V，VGS＝－2V，VTP＝－1V20、Forn-channelandp-channelMOSFETs,thedrainsourcevoltageVDScanbepositiveornegativevalue.答案:錯誤

分析：Fornchannel,VDS>0,butforp-channel,VDS<0;21、Forn-channeldepletion-moseMOSFETs,thegatesourcevoltageVGSmustbepositiveinordertogettheMOSFETsworkinthesaturationregion.答案:錯誤

分析：fordepletion-mode,theVGScanbenegativevalue.22、Thethresholdvoltageofp-channelandn-channelenhancement-modeMOSFETsmustbepositive.答案:錯誤

分析：Fornchannel,thresholdvoltage>0,butforp-channel,thresholdvoltage<0;Lecture4BasicFETAmplifiersTestquestionsforBasicFETAmplifiers1、AssumingthatthecapacitorsinthecircuitareverylargeandcanberegardedasshortcircuittoACsignal,thesmallsignalequivalentcircuitis（

）?

答案:2、AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andthecircuitwiththelargestinputresistanceis（

）.答案:3、AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthecapacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuithasthelowestinputresistance（

）答案:4、AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthe

capacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuithasthelowestoutput

resistance（

）答案:5、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.ThegmofT1isgm=1mS.DeterminethevoltagegainofthecircuitAv=vo/vi=（

）答案:-3.36、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（

）答案:-37、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（

）答案:-18、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（

）答案:-69、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（

）.答案:-210、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（

）答案:-311、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethevoltagegainofthecircuitAv=vo/vi=（）.答案:0.8912、AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthe

capacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuitshaveoutputandinput

signalsinphase（

）答案:;13、AssumingthattheDCoperatingpointsofallthefollowingamplifiercircuitsarenormal,allofthe

capacitorstoACsignalcanberegardedasashortcircuit,andwhichcircuitshaveoutputandinput

signalsoppositephase（

）答案:;;14、Inthemultistageamplifiercircuit,theinputresistanceistheinputresistanceofthefirststage,andtheoutputresistanceoftheamplifiercircuitisequaltotheoutputresistanceofthelaststage(outputstage).答案:正確15、Becausethevoltagegainofcommondrainamplifiercircuitislessthan1,itcannotbeusedintheamplifiercircuit答案:錯誤

分析：TheinputresistanceoftheCDamplifierisverylarge,itcanbeusedtoactiveload,imporvethefirststagevoltagegain.16、Becausethestructuresofn-channelenhancementMOSFETandp-channelenhancementMOSFETare

different,theDCbiasofamplifiercircuitisdifferent,andthesmallmodelusedinACanalysisisalsodifferent.答案:錯誤

分析：TheDCbiasofamplifiercircuitisdifferent,butthesmallmodelusedinACanalysisissame.17、Thefieldeffecttransistor(FET)worksinthesaturationregionandcanbeusedasanamplifier.

TheACamplificationperformanceisindependentoftheDCoperatingpoint.答案:錯誤

分析：TheacparametersgmandroaredeterminebyDCpoint.18、ThethresholdvoltageandtransconductanceofenhancementMOSFETareconstant.答案:錯誤

分析：Thethresholdvoltageisconstant,butgmisdeterminebyq-point.19、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasa

shortcircuit.ThegmofT1isgm=1mS.Determinetheinputresistanceis（

）kohm.

答案:2075

分析：Ri=Rg3+Rg1||Rg2=2000k+100k||300k=2075kohm20、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheoutputresistanceis(

)ohm.

答案:500

分析：gm=2root(KnIDQ)=2root(11)=2mS,Ro=1/gm=1/2mS=500ohm.21、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheinputresistanceis(

)ohm.

答案:1000

分析：gm=2root(KnIDQ)=2root(0.50.5)=1mS,Ro=1/gm=1/1mS=1000ohm.22、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.DeterminethesourcevoltagegainofthecircuitAv=vo/vs=(

).

答案:5

分析：gm=2root(KnIDQ)=2root(0.50.5)=1mS,Av=gmRd=1ms10kohm=10,forthesource,AVS=AvRi/(Ri+Rsi)=101/(1+1)=5.23、Thecircuitisasshowninthefigure,andthecapacitanceinthepassbandcanberegardedasashortcircuit.Determinetheoutputresistanceis(

)kohm.

答案:10

分析：ForCGamplifier,theoutputresistancejustRd.Lecture5TheBipolarJunctionTransistorTestquestionsforTheBipolarJunctionTransistor1、WhenaBJTtransistorisusedasanamplifyingdevice,thebase-emitterjunctionis(

)biased,andthebase-collectorjunctionis(

)biased.答案:Forward,reverse2、FortheimpuritydopingconcentrationsinthethreeregionsoftheBJT,whichregionisthehighest(

)答案:emitter3、WhenaBJTtransistorworkedinsaturationregion,thebase-emitterjunctionis(

)biased,andthebase-collectorjunctionis(

)biased.答案:Forward，forward4、Atransistorisbiasedintheforward-activemode,thecurrentofthethreeterminalsareI1=–1.2mA,

I2=–0.03mA,I3=1.23mA，whichoftheseistheemitterterminal(

)，and

whichoftheseisthebaseterminal(

)答案:3,25、InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesinforward-activemode(

)答案:VC=6V,VB=0.7V,VE=0V6、InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesincutoffregion(

)（Forsilicontransistor，wethinkVBE（th）=0.5V）答案:VC=6V,VB=4V,VE=3.6V7、Intheamplificationcircuit,theBJTisworkedinforward-activeregion,andthevoltageofeachterminalsisV1=2V,V2=6VandV3=2.7V,forthethreeterminals,whichistheemitter(

),thetypeofthistransistoris(

).答案:1,NPN8、ForthecircuitshowninFigure,whichregiondoesthetransistorworkin(

)答案:Saturationregion9、ForthecircuitshowninFigure,whichregiondoesthetransistorworkin(

)答案:Forward-activeregion10、ForthecircuitshowninFigure,whichregiondoesthetransistorworkin(

)答案:Forward-activeregion11、ForthecircuitshowninFigure,iftheinputsignalisagoodsinusoidalsignal,buttheoutputwaveformisintheFigure16,sothisiswhichdistortion(

)答案:Saturationregion12、Atransistorisbiasedintheforward-activemode,thecurrentofthethreeterminalsare

I1=–1.2mA,I2=–0.03mA,I3=1.23mA，thecurrentgainβis(

)答案:4013、InaBJTcircuit,thetransistoraremadeofsilicon,andthevoltagevaluesforthreeterminalsaregiven,whichBJToperatesinsaturationregion(

)答案:VC=6V,VB=6V,VE=5.4V;

VC=3.6V,VB=4V,VE=3.4V14、ForthecircuitshowninFigure,iftheinputsignalisagoodsinusoidalsignal,buttheoutputwaveformisintheFigure,sowhatmeasurescanbetakentoeliminatesuchdistortion(

)答案:increaseVCCamplitude;

reducetheamplitudeofsignalsource;

reducethevalueofloadresistanceRL15、IftheemitterandcollectorofBJTtransistorareexchanged,theamplifiercanstillbeconstructed.答案:錯誤16、WhenNPNtransistorworksintheforwardactiveregion,generallyweaddedpositivepowersupply,butforPNPtransistor,wemustaddnegativepowersupply.答案:錯誤17、ForthecircuitshowninFigure,theoperationalamplifierisassumedtobeideal,forthetransistorVBE=VB-VE=0.7V,ifthereadingofthevoltmeteris200mV,thenthecurrentgainβofthetransistoris(

)

答案:50Lecture6BasicBJTAmplifiersTestquestionsforBasicBJTAmplifiers1、

ForthecircuitshowninFigure,determinethesmallsignalhybrid-πresistancerπis(

)andthevoltagegainis（

）答案:2.6kohm,-2002、ForallofthecircuitsshowninFigure,whichcircuitcanamplifyACsmallsignal(

)答案:(b)3、ForthecircuitshowninFigure,whichpositionistheswitchinA,B,C?thetransistorcanworkintheforwardactiveregion(

)答案:B4、ForthecircuitshowninFigure,ifthetransistorworksintheforwardactiveregion,whichoutput

waveformiscorrect(

)答案:5、ForthecircuitshowninFigure,ifthetransistorworksintheforwardactiveregion,whichoutputwaveformiscorrect(

)答案:6、Ifthesourceresistanceofthesignalsourceis1kohm，andwhentheamplifyingcircuitisnotconnected,thevoltageamplitudeofthesignalsourceis10mV，butwhentheamplifyingcircuitisconnected,thevoltageoftheinputportoftheamplifyingcircuitis8mV，thentheinputresistanceoftheamplifyingcircuitis(

)kohm.答案:47、Fortheamplifier,whentheloadisopen,theoutputvoltageis4V,andwhenthe3kohmloadresistorisconnected,theoutputvoltageis3V,thentheoutputresistanceoftheamplificationcircuitis(

)kohm.答案:18、Fortheamplifier,whentheinputsignalis10pAcurrentandtheoutputis500mVvoltage,theinputresistanceofthisamplifierisbetterifitislargerorsmaller,andthetheoutputresistanceofthisamplifierisbetterifitislargerorsmaller(

)答案:smaller,smaller9、ForthecircuitshowninFigure，thevoltagegainis（

）,andtheinputresistanceis(

)kohm,outputresisdtanceis

(

)kohm.答案:-145,0.69,210、ForthecircuitshowninFigure，thevoltagegainis（

）,andtheinputresistanceis(

)kohm,outputresisdtanceis

(

)kohm.答案:-87,1.55,311、ForthecircuitshowninFigure，whenthe50uFcapacitorisopen,thethevoltagegainiswill(

)andtheinputresistancewill(

),outputresisdtancewill(

).答案:decrease,increase,unchanged12、ForthecircuitshowninFigure，thevoltagegainis（

）,andtheinputresistanceis(

)kohm,outputresisdtanceis

(

)

ohm.答案:0.99,87.2,3313、ForthecircuitshowninFigure，whentheouputvoltageisVo1,thesourcevoltagegainVo1/vsis（

）,andtheinputresistanceis(

)kohm,outputresisdtanceis

(

)

ohm.答案:-0.79,8.2,2k14、ForthecircuitshowninFigure，whentheouputvoltageisVo2,thesourcevoltagegainis（

）,andtheinputresistanceis(

)kohm,outputresisdtanceis

(

)

ohm.答案:0.8,8.2,3115、ForthecircuitshowninFigure，thevoltagegainis（

）,andtheinputresistanceis(

)kohm,outputresisdtanceis

(

)

ohm.答案:291,0.025,7.5k16、Inthefollowingcircuits,whichcircuithastheleastinputresistance(

)答案:17、Inthefollowingcirc