信号发生器中英文翻译.docx
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信号发生器中英文翻译.docx
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信号发生器中英文翻译
毕业设计(论文)外文资料翻译
系别:
电子信息系
专业:
通信工程
班级:
B090310
姓名:
王海涛
学号:
B09031018
外文出处:
annulreviews
附件:
1.原文;2.译文
2013年06月
Signalgenerator
Signalgeneratorisreferstoproducetheparametersofelectrictestingsignalequipment.Accordingtothesignalwaveform,thefunctioncanbedividedintosinesignal(waveform)signal,pulsesignalandrandomsignalgeneratorandsoonfourcategories.Signalgeneratoralsocalledsourceoroscillator,inproductionpracticeandscienceandtechnologyhasbeenwidelyusedinthefield.Variouswaveformcurvecanberepresentedwithtrigonometricfunctionequation.Canproducevariouswaveform,suchastrianglewave,sawtoothwave,rectanglewave(includingsquarewave),sinewaveofthecircuitiscalledafunctionsignalgenerator.
Alsoknownasthesignalgenerator,whichisusedtoproducespecificparametersrequiredforthecircuitbeingmeasuredelectrictestingsignal.Intesting,research,oradjusttheelectroniccircuitsanddevices,measurementcircuitofsomeelectricparameters,suchasmeasuringthefrequencyresponse,noisecoefficient,forvoltmeter,etc,arerequiredtoconformtotheconditionssetbythetechnologyofelectricalsignals,tosimulateausedintheactualworkofexcitationsignalofthedeviceundertest.Whentherequirementofsystemsteadystatecharacteristicsofthemeasurement,needtousesinesignalsourceofknownamplitudeandfrequency.Whenthetransientcharacteristicsofthetestingsystem,andtousefronttime,pulsewidthandrepetitionperiodknownrectangularpulsesource.Andtheparametersofthesignalsourceoutputsignal,suchasfrequency,waveform,theoutputvoltage,orpower,canundercertain?
Workingprincipleofthesignalgenerator
Signalgeneratorisusedtoproducefrequencyof20hz~200KHZsinesignal(lowfrequency).Besideshasthevoltageoutput,andpoweroutput.Sotheusageisverywide,canbeusedfortestingorrepairavarietyofelectronicinstrumentsandequipmentinthefrequencycharacteristicofthelowfrequencyamplifier,gain,passband,alsocanbeusedforoutermodulationsignalofhighfrequencysignalgenerator.Inaddition,electronicvoltmeterincalibration,itcanprovideacvoltagesignal.Low-frequencysignalgenerator:
theprincipleofthesystemincludingthemainvibrationlevel,themainvibrationoutputadjustmentpotentiometer,voltageamplifier,attenuator,poweramplifierandoutputimpedanceconverter(outputtransformer)andinstructsthevoltmeter.
Mainvibrationlevellowfrequencysinusoidaloscillationsignals,thevoltageamplifieramplification,toachievetherequirementoftheoutputvoltageamplitude,theattenuatorcanbedirectlyoutputvoltageoutput,withthemainvibrationoutputadjustmentpotentiometertoadjustthesizeoftheoutputvoltage.
Signalgeneratorisintroduced
Sinesignalgenerator:
sinesignalismainlyusedinthemeasuringcircuitandfrequencycharacteristicofthesystem,thenonlineardistortion,gainandsensitivity,etc.Accordingtothefrequencyrangecanbedividedintolow-frequencysignalgenerator,high-frequencysignalgeneratorandthemicrowavesignalgenerator;Accordingtotheoutputlevelcanbeadjustedthescopeanddegreeofstabilitycanbedividedintosimplesignalgenerator(signal)andstandardsignalgenerator(attenuationtotheoutputpowercanbeaccurately-100decibelsbelowmilliwatts)andpowersignalgenerator(outputpoweruptotensofmilliwatts);Wayfrequencychangeintotunertypesignalgenerator,frequencysweepsignalgenerator,program-controlledsignalgeneratorandfrequencysynthesistypesignalgenerator,etc.
Lowfrequencysignalgenerator:
thisincludesaudio(200~20000hz)andvideo(1hz~10MHz)rangeofsinewavegenerator.MainvibrationlevelgenerallyuseRCoscillator,differencefrequencyoscillatorisalsoavailable.Foreaseoftestingsystemfrequencycharacteristicandaskedforpeaceamplitude-frequencycharacteristicwaveformdistortion.
Highfrequencysignalgenerator,frequencyof100KHZto30MHZfrequency,VHFsignalgeneratorof30~300MHZ.GeneraluseLCtunedoscillator,frequencycanbereadbytuningcapacitordialscale.Mainpurposeistomeasureallthereceivertechnologyindicators.Outputsignalisavailableinternallyorwiththelow-frequencysineamplitudemodulationorfrequencymodulationsignal,theoutputfrequencyvoltagecandecaytomicrovoltunder1.Theoutputsignallevelcanaccuratereadings,adjustableamplitudeorfrequencycanalsobeusedforelectricitymeterreading.Inaddition,theinstrumentandtopreventleakagesignalofgoodshielding.
Standardsignalgenerator
Microwavesignalgenerator:
fromdecimeterwavetomillimeterwavebandofthesignalgenerator.Signalisusuallybyuhftriodewithdistributionparametersoftheresonatorandthereflexklystron,buthasgraduallybemicrowavetransistor,fieldeffecttubeandgunndiodesolid-statedevicestoreplacethetrend.Instrumentsgenerallyrelyonmechanicaltuningcavitytochangefrequency,eachcoveringoneoctave,signalpowerisgeneralbycavitycouplingcanbeupto10milliwatts.Simplesignalsourcerequiresonlycanadd1000HeFangwaveamplitudemodulation,whilestandardsignalgeneratorwilloutputabenchmarkleveladjustmenttoonemilliwatt,againfromthebackwiththeattenuatordbmilliwattsofthereadoutsignalvalue;Mustalsohaveinternalorwithrectangularpulseamplitudemodulation,inordertotesttheradarreceiver.
Frequencysweepandprogram-controlledsignalgenerator,frequencysweepsignalgeneratorcanproduceconstantamplitude,frequency,inlimitedwithinthescopeoflinearchangesignal.InhfandVHFfrequencyscanningvoltageorcurrentcontroloscillationcircuitcomponents(suchasavaractortubeorcorecoil)toimplementthefrequencysweeposcillator;Inmicrowaveparagraphearlyusevoltagetuningfrequencysweep,usechangethebackwardwavepipespiralelectrodeofthedcvoltagetochangetheoscillationfrequency,thenwidelyusedmagnetictuningfrequencysweep,YIGferriteballformicrowavesolidoscillatortuningcircuit,byscanningcurrentcontroldcmagneticfieldchangestheresonancefrequencyoftheball.Frequencysweepsignalgeneratorwithautomaticsweep,handcontrol,processcontrolandremotecontrol,etc.
Frequencysynthesistypesignalgenerator:
thissignalgeneratorisnotproducedbytheoscillatordirectly,butratherserveasstandardfrequencysourcewithhighstabilitycrystaloscillator,frequencysynthesistechnologyisusedtoformthearbitraryfrequencyofthesignal,isthesameasthestandardfrequencysourcefrequencyaccuracyandstability.OutputsignalfrequencyaccordingtodecimalNumbersoftengo,highestcanreach11digitalhighresolution.Frequencyexceptbymanualselectioncanalsobeprogrammedcontrolandremotecontrol,alsocanbecarriedoutstepmagnitudefrequencysweep,issuitableforautomatictestsystem.Directfrequencysynthesizerbyaddition,multiplication,crystaloscillator,filterandamplificationcircuit,frequencytransformationrapidlybutcomplicatedcircuits,highoutputfrequencycanreacharound1000MHZ.Usemorerindirectfrequency.
Functiongenerator,alsocalledwaveformgenerator.Itcanproducecertaincyclicaltimefunctionwaveform(mainlysinewave,squarewave,trianglewave,sawtoothwaveandpulsewave,etc.).FrequencyrangecanbefromafewhzJiWeihzultra-lowfrequencyuntileventensofmegahertz.Exceptforcommunications,instrumentationandautomaticcontrolsystemtest,alsowidelyusedinothernon-electricmeasurementfield.Onemethodoffigure2togeneratethewaveform,theintegralcircuitandacertainthresholdswitchingcircuitwithhysteresischaracteristics,suchasSchmitttriggerisconnectedintoaloop,integratorcansquareintegralintotrianglewave.Schmittcircuitandcanmakeatrianglewaverisestoacertainthresholdorfallintoanotherthresholdjumptoformasquarewave,frequencydivisioncanalongwiththeintegratoroftheRCvalueofthevariable.
Pulsesignalgenerator:
width,amplitudeandrepetitionfrequencyadjustablerectangularpulsegenerator,canbeusedtotestthetransientresponseoflinearsystems,orusetheanalogsignaltotesttheradar,roadandotherperformanceofthepulsenumbersystem.Pulsegeneratorismainlycomposedofmasteroscillator,delay,pulseformingstage,outputstageandattenuatoretc.Masteroscillatorcircuitforharmonicoscillator,usuallyinadditiontooutsidetheself-excitedoscillation,themainworkaccordingtothetriggermode.Usuallyafteradditionaltriggersignaloutputafront-facingfirsttriggerpulse,inordertotriggertheoscilloscopeobservationinstrument,inadvanceandthenafteraperiodofdelaytimeisadjustabletooutputthesignalpulse,thewidthcanbeadjusted.Somecanoutputpairsofmainpulse,?
Randomsignalgenerator:
randomnoisesignalgeneratorandthepseudorandomsignalgeneratorcanbedividedintotwokindsofsignalgenerator.
Noisesignalgenerator:
completelyrandomsignaliswithintheworkingfrequencybandwithuniformwhitenoisespectrum.Commonlyusedwhitenoisegeneratorare:
workingat1000MHzsaturateddiodetypeofcoaxialsystemunderwhitenoisegenerator;Microwavegasdischargetubewaveguidesystemusedinwhitenoisegenerator;Usingthenoiseofthecrystaldiodereversecurrentsolid-state(canworkunder18GHz)acrossthespectrum,etc.Theintensityofthenoisegeneratoroutputmustbeknown,usuallywiththeoutputnoisepowerovertheresistorthermalnoisedecibels(referredtoasthes/nratio)orbytheirnoisetemperature.Withwhitenoiseasinputsignals,forexamp
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