RFGlossary术语.docx
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RFGlossary术语.docx
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RFGlossary术语
RF&Microwave Glossary
'A'Carrier:
Thenonwirecellularcompany,thatoperatesinradiofrequenciesfrom824to849Mhz.
AGC:
AutomaticGainControl-Afeedbackcontrolcircuitwhichmaintainsthegainoroutputpowerlevelofanamplifierconstantoverawiderangeofinputsignallevels.
Airtime:
Timespentonacellularphone,whichisusuallybilledtothesubscriberonaperminutebasis.
Alumina(AluminumOxide,Al2O3):
Aluminaceramicisusedasthesubstratematerialonwhichisdepositedthinconductiveandresistivelayersforthinfilmmicrowaveintegratedcircuits.
AMNoise:
Therandomand/orsystematicvariationsinoutputpoweramplitude.UsuallyexpressedintermsofdBcinaspecifiedvideobandwidthataspecifiedfrequencyremovedfromthecarrier.
AM-PMConversion:
AM-PMconversionrepresentsashiftinthephasedelayofasignalwhenatransistorchangesfromsmall-signaltolarge-signaloperatingconditions.Thisparameterisspecifiedforcommunicationsamplifiers,sinceAM-PMconversionresultsindistortionofasignalwaveform.
AMPS:
Advancedmobilephoneservice,thestandardforanalogcellulartelephones.
ANA:
AutomaticNetworkAnalyzer-AcomputercontrolledtestsystemthatmeasuresmicrowavedevicesintermsoftheirsmallsignalS-parameters.Theuseofthisinstrumentbybothengineeringandproductionpermitsquickandaccuratecharacterizationoftheinputandoutputimpedance,gain,reverseisolationofindividualunitsandthedegreeofmatchbetweenunits.
Analog:
Thetraditionalmethodoftransmittingvoicesignalswheretheradiowaveisbasedonelectricalimpulses,whichoccurwhenspeakingintothephone.Mostcellularcompaniestodaytransmitinanalog.
AnalogDriver:
Anaccessorycircuitforanoscillatoroffilterwhichpermitsitsfrequencytobechangedbyacontinuouslyvaryingsignal.
ATE
Automatic(orAutomated)TestEquipment
ATP
AcceptanceTestProcedure
Attenuator:
Adeviceornetworkthatabsorbspartofasignalandtransmitstheremainderwithaminimumofdistortion.
ChooseAnotherWord
'B'carrier:
Thewirelinecellularcarrier,usuallythelocaltelephonecompany,thatoperatesonthefrequencies869to894Mhz.
Backmetallization:
Metalappliedtothesideofthetransistorwaferoppositetheactiveareas.Providesthecollectorcontactinbipolartransistorsandpermitsthetransistorchipstobebondedtothepackageorthin-filmcircuitsubstrate.
BalancedAmplifier:
Atransistoramplifierstageinwhichtwoidenticaltransistorsareusedandtheinputsignalandoutputpowerisequallydividedbetweenthem.ThistechniqueproducesapproximatelytwicetheoutputpowerofasingletransistorstagewithgenerallyimproveddynamicrangeandreducesVSWR.
BalancedModule:
Againmoduleofanamplifierwhichutilizesa3dBinputsplitteranda3dBoutputcouplertocombinethepoweroftwoormoreparalleledFETs.BalancedmoduleshavethecharacteristicsofgoodinputandoutputVSWRwhichlendstothecapabilityofseveralmodulesinanamplifier.Balancedmodulesalsohavethebenefitofindirectstabilityunderadversesourceandloadconditions.
BallBond(MIC):
Abondformedwhenaball-shapedendinterconnectingwireisdeformedbythermocompressionagainstametallizedpad.Thebondisalsodesignatedanailheadbondfromtheappearanceoftheflattenedball.
BaseStation:
Thefixedtransmitter/receiverwithwhichamobileradiotransceiverestablishesacommunicationlinktogainaccesstothepublic-switchedtelephonenetwork.
BerylliumOxide(BeO):
Aceramicmaterialhavingveryhighheatconductivity,goodthermalshockresistanceandhighstrength.Usedinmetal/ceramicpackagesforhigherpowermicrowavetransistorsandassubstratesinsomeMICpoweramplifiers.
BIT/BITE:
Built-inTest/Built-inTestEquipment-Someproductshaveprovisionsforconnectiontocustomer-suppliedtestortestequipmentthatisapartofthesysteminwhichtheproductsareused.Generally,amilitary/aerospacetermforequipmentthatcontainsanautomaticself-testingfunction.
BondingPad(MIC):
Ametallizedareaattheendofathinmetallicstriptowhichaconnectionistobemade.
BondingWire(MIC):
Finegoldoraluminumwireformakingelectricalconnectionsinhybridcircuits.
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CAD/CAM:
ComputerAidedDesign/ComputerAidedManufacturing
Cascadable:
Adeviceiscascadableiftheoutputportofonesuchdevicecanbeconnectedtotheinputportofanothersuchdevicewithoutadditionalimpedancematchingbeingrequired.
Cascade:
Aseriesofmicrowaveamplifierstagesconnectedinsequence(sometimesincludinglimiters,attenuatorsorotherelements)toproducethedesiredgain,poweroutputandotherperformancecharacteristics.HPmodularproductsaredesignedtobecascadedina50°micro-stripsystem.
Cavity:
Inmicrowaveparlance,ametallicenclosurewhichcanbemadetoresonateatadesiredfrequency.Primarilyusedtodescribeacavityfilter,whichisahighly-selectivetuningelementatmicrowavefrequenciesthatmaybeusedasthefrequency-determiningelementofanoscillatororasalowpass,bandpassorhighpassfilter.Generallyoffixedfrequencyormechanicallytunableoveraverylimitedfrequencyrange.
CCIS7
CommonChannelInterofficeSignalingSystem#7,aCCITTstandard
CCITT
ConsultativeCommitteeforInternationalTelephonyandTelegraphy
CDPD
CellularDigitalPacketData
Cell:
Thegeographicareaservedbyasinglelow-powertransmitter/receiver.Acellularsystem'sserviceareaisdividedintomultiple'cells'.
Ceramic:
See:
Beryllia,Alumina
CertificateofCompliance:
Adocumentshippedwithacustomer-orderedproductwhenrequiredbycontractthatindicatesthattheproductmeetsorexceedsallcustomer-specifiedperformancecharacteristics.
Channel:
Thewidthofthespectrumbandtakenupbyaradiosignal,usuallymeasuredinkilohertz(kHz).Mostanalogcellularphonesuse30-kHzchannel.
Chip:
Theuncasedandnormallyleadlessformofanelectroniccomponentpart,eitherpassiveoractive,discreteorintegrated.
Circuit:
Theinterconnectionofthenumberofelectricalelementsand/ordevices,performingdesiredelectricalfunction.
CNR
Carrier-to-NoiseRatio
Coaxial:
Coaxialcable-Atransmissionlineinwhichoneconductorcompletelysurroundstheother,thetwobeingcoaxialandseparatedbyacontinuousdielectricordielectricspacers.
CoaxialCable:
Acableconsistingofonecenterconductortocarryasignal,surroundedconcentrically(coaxial)byaninsulatingdielectricandaseparateouterconductor(braidormetaljacket)whichactsasashield.
Code-DivisionMultiple-Access(CDMA):
Adigitaltechnologythatusesalow-powersignal'spread'acrossawideband-width.WithCDMAaphonecallisassignedacodeinsteadofacertainfrequency.Usingtheidentifyingcodeandalowpowersignal,alargenumberofcallerscanusethesamegroupofchannels.SomeestimatesindicateCDMA'scapacityincreaseoveranalogmaybeasmuchas20to1.TheTelecommunicationsIndustryAssociation(TIA)hasawardedCDMAinterimstandardapproval(IS-95).
CombinedRippleandSpurious:
Theworstcasetransmissionloss(indB)withintheYIGfilter3dBpassbandduetothepresenceofpassbandspuriousandorpassbandrippleresponses.
Communications:
Electronictransferofinformationbetweeneachbasestationterminalandrelatedequipment.
ControlDevices:
Acomponentusedtoswitch,limit,modulateorattenuatemicrowavesignals.
ConversionCompressionPoint(1dB):
ThespecificationwhichstatestheRFinputpower(indBm)atwhichtheIFoutputpowerwillincreaseonly9dBfora10dBincreaseinRFinputpoweratstatedLOpowerlevel.
Conversioncompressionpointprovidesanindicationofthemixertwo-toneintermodulationperformanceandusuallyisofmostconcerninhighlevelmixingapplications.
ConversionLoss:
Theratio(indB)oftheIFoutputpowerofamixertotheRFinputpower.Allconversionlossmeasurementsandspecificationsarenormallybasedonthemixerbeinginstalledinasystemwithwideband50 resistiveterminationsonallportsandastatedLOsignalpowerlevelbeingapplied.
CrossModulationDistortion:
TheamountofmodulationimpressedonanunmodulatedcarrierwhenasignalissimultaneouslyappliedtotheRFportofamixerunderspecifiedoperatingconditions.Thetendencyofamixertoproducecrossmodulationisdecreasedwithanincreaseinconversioncompressionpointandinterceptpoint.
CT-1:
Cordlesstelephone-firstgeneration;anyvarietyofNorthAmerican,European,andJapaneseanalogcordlesstelephone.
CT-2:
Cordlesstelephone-secondgeneration;adigitalcordlesstelephonestandard:
generallyusedinresidentialcordlessphone,atelepointapplication,orasmall-officeWPBXsystem.
CT-3:
CordlessTelephone3rdGeneration(standardsstillformative)
CTIA:
CellularTelecommunicationsIndustryAssociation
CW:
ContinuousWave-Signalofconstantamplitude.Usedtodifferentiatebetweentheperformancesofamicrowavecomponentforcontinuouspowerlevelsvs.pulsedsignals.Forexample,thisamplifierwillacceptupto+30dBmCW(orcontinuous)orupto+50dBmpeak(upto5microseconddurationwithlowdutycycle)inputpowerwithoutperformancedegradation.
dB:
Decibel-Aunitofgainequaltotentimesthecommonlogarithmoftheratiooftwopowerlevelsor20timesthecommonlogarithmoftheratiooftwovoltagelevels.
dBc:
Decibelrelatedtothesignalcarrierlevel
dBm:
Decibelsrelatedto1mW-thestandardunitofpowerlevelusedinmicrowavework.Forexample,0dBm=1mW,+10dBm=10mW,+20dBm=100mW,etc.
DCC
DigitalCrossConnection
DCS1800:
Digital
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