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1、GlossaryofEEtermsAccelerationAccelerationisthechangeinlinearvelocity.AccelerometerAnaccelerometerisasensorthatmeasuresacceleration.AcquisitionTimeThistermrelatestosamplingA/Ds,whichuseatrack/holdamplifierontheinputtoacquireandhold(toaspecifictolerance)theanaloginput
2、signal.AcquisitiontimeisthetimerequiredbytheT/Hamplifiertosettletoitsfinalvalueafteritisplacedinthetrackmode.ActiveFilterAnactivefilterisonethatusesactivedevicessuchasoperationalamplifierstosynthesizethefilterresponsefunction.Thistechniquehasanadvantageathighspeedsb
3、ecausetheneedforinductors(withtheirpoorhigh-frequencycharacteristics)iseliminated.ADIsimADC™TheADIsimADCtoolisanaidtohelpintheselectionofAnalogtoDigitalConverters(ADCs,A/DConverters),performevaluationsandassistwithtroubleshooting.Thetoolusestypicaldatavaluestomathem
4、aticallymodelthegeneralbehavioroftheselectedADC.Itallowsausertoapplyinputsignals,setencode(sample)ratesandsimulateFFT'sonaselecteda/dconverter.ItisusefulforcheckingtheSNR,SFDR,SINAD,THD,ENOBetc.ofaselectedADC.Note:ThistooldoesnotfullymodelallaspectsofanAtoDandshould
5、notbeusedinplaceofactualhardwaretesting.Additionalfunctionscanbefoundusingthefullfeatureddownloadableversionofthistool.(Formoreinformation,pleaseseetheapplicationnote,AN-737pdf.)AdjacentChannelLeakageRatio(ACLR)AratioindBcbetweenthemeasuredpowerwithinachannelrelativ
6、etoanadjacentchannel.AdjacentChannelPowerRatio(ACPR)SeeAdjacentChannelLeakageRatio(ACLR).AliasedImagingThisisatechnique,commonlyappliedtoDirectDigitalSynthesis(DDS),forusingintentionalaliasingasasourceofhigh-frequencysignals.AliasingInasampleddatasystem,theanaloginp
7、utmustbesampledatarateofFS>2FAinordertoavoidlossofdata(NyquistTheorem).AdheringtotheNyquistTheorempreventsin-band"alias"signals,whicharebeatfrequenciesbetweentheanalogsignalandthesamplingclockthatinherentlyoccuratFS±FA.AstheNyquistlimitisexceeded,thealiasedsignalsmo
8、vewithinthebandoftheanaloginput(DC-FS/2)andcreatedistortion.Likewise,high-frequencynoisecanalsobealiasedintotheinputsignalrange,whichmanda
