模擬電子技術基礎（西安郵電大學）知到智慧樹章節(jié)測試課后答案2024年秋西安郵電大學

模擬電子技術基礎（西安郵電大學）知到智慧樹章節(jié)測試課后答案2024年秋西安郵電大學第一章單元測試

Whichofthefollowingisnotacommonlyusedsemiconductormaterial'?（

）

A:carbonB:leadC:germaniumD:silicon

答案:leadThecharacteristicofanidealdiodearethoseofaswitchthatcanconductcurrent（

）

.

A:inbothdirectionsbutinonlyonedirectionatatimeB:dependsonthecircuititisusedinC:inbothdirectionsD:inonedirectiononly

答案:inonedirectiononlyWhenadiodeisdopedwitheitherapentavalentoratrivalentimpurityitsresistancewill（

）

.

A:increaseB:maketheresistancestableagainstvariationduetotemperatureC:decrease

答案:decreaseThepiecewiselinearmodel,equivalentcircuitofthediodeconsistsof（

）.

A:abattery,asmallresistor,andtheidealdiodeB:abatteryandtheidealdiodeC:ajunctioncapacitor,abattery,asmallresistor,andtheidealdiodeD:theidealdiode

答案:abattery,asmallresistor,andtheidealdiodeWhenap-njunctionisreverse-biased,itsjunctionresistanceis

（

）.

A:determinedbythecomponentsthatareexternaltothedeviceB:constantlychangingC:lowD:high

答案:high

第二章單元測試

Whatisthevalueofthevoltagedroppedacrossforward-biasedsilicondiodesthatareconnectedinparallelwitheachother?

（

）.

A:11.3VB:1.4VC:0.35VD:0.7V

答案:0.7VTheresistorvoltageandresistorcurrentinthiscircuitare（

）.

A:11V,11mAB:2V,11mA

C:11V,2mAD:10V,5mA

答案:11V,11mAWhichofthefollowingcircuitsisusedtoeliminateaportionofasignal?（

）.

A:ClipperB:DamperC:VoltagemultiplierD:Voltagedivider

答案:ClipperThecircuitshownhereisa（

）.

A:seriesclipper

B:parallelclipperC:seriesclamperD:shuntclamper

答案:parallelclipperTheZenerdiodemustbeoperatedsuchthat（

）.

A:B:theappliedvoltageisgreaterthan

C:

islessthanthespecified

D:Allofthese

答案:Allofthese

第三章單元測試

Intheactiveregion,thebase-emitterjunction

（

）.

A:andthebase-collectorjunctionsarebothforward-biasedB:andthebase-collectorjunctionsarebothreverse-biasedC:isreverse-biasedwhilethebase-collectorjunctionisforward-biasedD:isforward-biasedwhilethebase-collectorjunctionisreversed-biased

答案:isforward-biasedwhilethebase-collectorjunctionisreversed-biasedABJThasmeasureddccurrentvaluesof=0.1mAand=8.0mA.WhenIBisvariedby100μA,ICchangesby10mA.Whatisthevalueoftheβacforthisdevice?（

）.

A:100B:10C:80D:800

答案:100WhenaBJTisoperatingintheactiveregion,thevoltagedropfromthebasetotheemitterisapproximatelyequaltothe（

）。

A:emittervoltageB:diodedrop(about0.7V)

C:basecurrenttimesthebaseresistorD:basebiasvoltage

答案:diodedrop(about0.7V)

BJTsarecommonlyusedas（

）.

A:theprimarycomponentsinrectifiersB:theprimarycomponentsinamplifiersC:seriesdampercircuits

答案:theprimarycomponentsinamplifiersTheconditionwhereincreaseinbiascurrentwillnotcausefurtherincreasesincollectorcurrentiscalled（

）.

A:activeoperationB:cutoffC:saturation

答案:saturation

第四章單元測試

WhenaBJTisbiasedinthecutoffregionthecollector-to-emittervoltageistypicallyequalto（

）.

A:0.03VB:theemittervoltageC:thecollectorcurrenttimesthecollectorresistorD:thecollectorsupplyvoltage

答案:thecollectorsupplyvoltage

Calculatethecollector-emittervoltageforthisemitter-stabilizedcircuit.（

）

A:0.1335VB:10.68VC:4.32VD:14.24V

答案:4.32VThedifferencebetweentheresultingequationsforanetworkinwhichannpntransistorhasbeenreplacedbyapnptransistoris（

）.

A:thevalueofβB:thevaluesoftheresistorsC:thesignassociateswiththeparticularquantities

答案:thesignassociateswiththeparticularquantitiesThetermquiescentmeans（

）.

A:midpoint-biasedB:activeC:inactiveD:atrest

答案:inactiveVoltage-dividerbiasstabilityis（

）.

A:dependentonthecollectorresistorB:dependentonalphaC:dependentofbetaD:independentofbeta

答案:independentofbeta

第五章單元測試

Giventhisconfiguration,determinetheinputimpedanceifVS=40mV,Rsense=0.5kΩ,andtheinputcurrentis20μA.（

）

A:582kΩB:5.822MΩC:1.5MΩD:1,500Ω

答案:1,500ΩThetransistormodelreplacesthe（

）

withthejunctiondiode'sacresistance.

A:collector-emitterjunctionB:emitter—basejunction

C:collector-basejunction

答案:emitter—basejunction

Calculatethevoltagegainforthiscircuit.

（

）

A:

-7.91B:-8.4C:-137.25D:-16.34

答案:-137.25Atransistoramplifierhasaninputsignalappliedtoitsemitterterminalandanoutputsignaltakenfromitscollectorterminal.Theamplifierisa(n)（

）.

A:emitterfollowerB:common-baseamplifierC:common-emitteramplifierD:common-collectoramplifier

答案:common-baseamplifierThevoltagegainofaverywell-designedcommoncollectoramplifierconfiguration,usingapnptransistor,is（

）.

A:about-0.9B:intherange-0.95to-0.99C:about0.9D:intherange0.95to0.99

答案:intherange0.95to0.99

第六章單元測試

Shockley'sequationdefinesthe（

）

oftheFETandareunaffectedbythenetworkinwhichthedeviceisemployed.

A:input/outputcharacteristicsB:

characteristicsC:draincharacteristicsD:transfercharacteristics

答案:transfercharacteristicsForann-channeldepletionMOSFET,=8mAand=-6V.If=0.8V,whatisthevalueofthedraincurrent,?

（

）

A:8mAB:10.28mAC:10.25μAD:6mA

答案:10.28mATheregionoftheJFETdraincurvethatliesbetweenpinch-offandbreakdowniscalled（

）.

A:thesaturationregionB:theconstant-voltageregionC:theohmicregion

答案:thesaturationregionInthefamilyofFETs,youcanexpecttofind

（

）.

A:unipolarstructureB:an

n-channeltypeC:a

p-channeltype

答案:unipolarstructure；an

n-channeltype；a

p-channeltypeFETsusually（

）.

A:arelesssensitivetotemperaturechangethanBJTsB:haveahigherinputimpudencethanBJTsC:aresmallerinconstructionthanBJTs

答案:arelesssensitivetotemperaturechangethanBJTs；haveahigherinputimpudencethanBJTs；aresmallerinconstructionthanBJTs

第七章單元測試

Thisgraphicalsolutionrepresents（

）.

A:voltage-dividerbiasforan

n-channelJFETB:selfbiasforan

n-channelJFETC:fixedbiasforan

n-channelJFET

答案:selfbiasforan

n-channelJFETGenerally,itisgooddesignpracticeforlinearamplifierstohaveoperatingpointsthatcloseto（

）.

A:areclosetosaturationlevelB:thecut-offregionC:themidpointoftheloadline

答案:themidpointoftheloadlineWhichofthefollowingbiasingcircuitscanbeusedwithE-MOSFETs?

（

）

A:drain-feedbackbiasB:zerobiasC:selfbiasD:current-sourcebias

答案:drain-feedbackbiasTheprimarydifferencebetweenJFETsanddepletion-typeMOSFETsis（

）.

A:depletion-typeMOSFETscanhaveonlypositiveofB:JFETscanhavepositivevaluesof

andlevelsofdraincurrentthatexceedC:depletion-typeMOSFETscanhavepositivevaluesof

andlevelsof

thatexceedD:JFETscanhaveonlypositivevaluesof

答案:depletion-typeMOSFETscanhavepositivevaluesof

andlevelsof

thatexceedAJFETcanbebiasedinseveraldifferentways.Thecommonmethod(s)ofbiasingann-channelJFETis(are)（

）.

A:voltage-dividerbiasconfigurationB:fixed-biasconfigurationC:self-biasconfiguration

答案:voltage-dividerbiasconfiguration；fixed-biasconfiguration；self-biasconfiguration

第八章單元測試

TheFETversionoftheBJT'scommon-emitterconfigurationisthe（

）

circuit.

A:common-sourceB:common-currentC:common-drainD:common-gate

答案:common-sourceCalculatetheinputimpedanceforthisFETamplifier.

（

）

A:B:

=woulddependonthedraincurrentC:D:

答案:Designthiscircuitforavoltagegainof10.Youhavetocalculatethevalueofresistorand.Itisdesiredthatthetransistoroperatewitharelativelyhighvalueof.Forthisdevice,ahighvalueofisdefinedas.（

）

A:B:C:D:

答案:The（

）

amplifierhashighinputimpedance,lowoutputimpedance,andlowvoltagegain.

A:common-gateB:common-sourceC:common-drain

答案:common-drainThe（

）

FETamplifierhaslowinputimpedance,highoutputimpedance,andhighvoltagegain.

A:common-sourceB:common-drainC:common-gate

答案:common-gate

第九章單元測試

Calculatethelowfrequencybreakpointduetothecapacitor

forthisBJTamplifier.（

）

A:B:C:D:

答案:Ifseveralidenticalstagesofamplifiers,eachhavingtheexactsameupperandlowercutofffrequencies,areconnectedincascade,thenthebandwidthoftheresultingamplifierwill（

）.

A:beequaltothesumofalltheindividualbandwidthsB:remainunchangedC:increaseD:decrease

答案:decreaseA3-dBdropinβoccursat（

）.

A:B:C:D:

答案:NegativedBvaluesrepresent（

）.

A:powerlossesB:powervaluesthatdonotchangeC:powergain

答案:powerlossesAnamplifierhasamidbandpowergainof24,500.WhatisthevalueofthepowergainindBforthecircuit?（

）

A:87.78dBB:43.9dBC:4.39dB

答案:43.9dB

第十章單元測試

Underdifference-modeoperation,thedifference-modevoltagegainforthiscircuitis（

）.

A:80B:40C:0.0397D:0.08

答案:40Theoperationalamplifierwillonlyslightlyamplifysignals（

）.

A:thataredifferentonboththeinputsB:thatarecommononboththeinputsC:whenthesupplyvoltagesaremorethen±25VD:whenthesupplyvoltagesarelessthen±5V

答案:thatarecommononboththeinputsTheinvertingandnoninvertinginputstoanop-ampareusedtodrivea(n)（

）

amplifier.

A:differentialB:noninvertingC:invertingD:open-loop

答案:differentialWhenagivenop-amphasacommon-modeinputof10V,theoutputofthedeviceis10V.

Whenthedevicehasadifferentialinputof2mV,theoutputofthedeviceis10V.WhatistheCMPRofthedevice?（

）

A:5,000,000:1B:5:1C:1000:1D:5000:1

答案:5000:1Thebandwidthofanamplifieris（

）.

A:

therangeoffrequenciesfoundusing

B:therangeoffrequenciesoverwhichgainremainsrelativelyconstant

C:therangeoffrequenciesbetweenthelowerandupper3dBfrequencies

答案:

therangeoffrequenciesfoundusing

；therangeoffrequenciesoverwhichgainremainsrelativelyconstant

；therangeoffrequenciesbetweenthelowerandupper3dBfrequencies

第十一章單元測試

Iftheinputvoltageis0.25Vandtheoutputis-2.5V,thevalueof

mustbe（

）.

A:40.0kΩB:20.0kΩC:5.0kΩD:16.0kΩ

答案:20.0kΩTheoutputvoltage,VO,isgivenby（

）.

A:B:C:

答案:Asummingintegratorisanop-ampintegratorthathas（

）.

A:multipleinputresistorsandfeedbackcapacitorsB:multipleinputresistorsC:multiplefeedbackcapacitors

答案:multipleinputresistorsandfeedbackcapacitorsAsecondorderlow-passfilterhasahigh-endroll-offof（

）.

A:40dB/decadeB:20dB/octaveC:60dB/octaveD:6dB/decade

答案:40dB/decadeAnactivefilterthatprovidesaconstantoutputforinputsignalsaboveiscalledanideal（

）.

A:bandpassfilterB:low-passfilterC:high-passfilter

答案:high-passfilter

第十二章單元測試

AclassBamplifier(notpush-pull)（

）.

A:conductsthrough180°oftheinputwaveformB:conductsthroughlessthan180°oftheinputwaveformC:conductsthrough360°oftheinputwaveformD:conductsbetween180°and360°degreesoftheinputwaveform,dependingontheamountofdcbias

答案:conductsthrough180°oftheinputwaveformCrossoverdistortioninclassBamplifiersispreventedby（

）.

A:usingcomplementary-symmetrytransistorsB:biasingthetransistorsdeeplyintocutoffC:increasingtheloadresistanceD:biasingthetransistorsslightlyabovecutoff

答案:biasingthetransistorsslightlyabovecutoffThemaximumtheoreticalefficiencyofanRC-coupledclassAamplifieris（

）.

A:25%B:78.5%C:50%D:99%

答案:25%Poweramplifiersaretypicallyusedtodrivelowimpedanceloads.（

）

A:錯B:對

答案:對Thepowerthatanamplifierdeliverstoaloadisequaltothedifferencebetweent