the abc of automatic fixture removal自动夹具拆卸基础知识.pptx

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the abc of automatic fixture removal自动夹具拆卸基础知识.pptx

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TheABCofAutomaticFixtureRemovalTheory,bestpracticeandlimitationsofAFRtechniquesChengNingApplicationEngineerKeysightTechnologies

MeasurementChallengesPhysicallayerdevicesoftenhavenon-coaxialconnectors,theycannotbeconnectedtotestinstrumentswithcoaxialportconnectorsICpackagesUSBconnectorBackplane

Twotraditionalmethodsofmeasuringnon-insertabledevicesProbingonthedeviceformeasurementBuildingtestfixturesforcoaxialtomicrostrip/striplinetransitionDrawback:ProbestationisexpensiveNeedprobecalkitandmodelsforprobecalibrationDrawback:Thefixturesarenotelectricallytransparent,theyhavemismatch,lossanddelay,theyneedtobecharacterizedandremovedfromtheDUTmeasurementThefixturesalsohavenon-coaxialconnectorsandcannotbemeasureddirectlyWe’llfocusonsolvingfixturingprobleminthispresentation

RemovingfixturesHistorically–2methods:ModelfixtureusingEMSimulationandde-embedthefixturesfromthemeasurementUseaTRLcalibrationtechniquetomovemeasurementreferenceplanestotheDUT.TRLCoaxCoax

TRLCalibration(SingleEnded)AssumptionsforsingleendedTRLConnectorsandlaunchesareidenticalAlllineshavesameTransmissionLine

characteristicsImpedance,loss,propagationOnlydifferinlengthLinesareusable20to160degrees

relativetothruUsually2-4linesdependingonfrequency

rangeFordifferentialfixturesNocouplinginfixtureisremoved

Bytheway,why20to160degrees?2-portDUTe00e11e10e01a0b0a1b1e22e33e32e23b2b3a2a3[TX][TA][TY]?Thrustep:?Delayedlinestep:??

TRLCalibration(SingleEnded)Difficulttodesignandfabricate,needsmuchexperience,hardtoguaranteegoodcalkitquality(Launchrepeatability,PCBimpedancevariations,etc)

Evenmorecomplicated-

DifferentialCrosstalkcalibration4-portTRLCalibrationTechniqueAvailableinKeysightPLTSsoftwareFixturemaybeasymmetricSimilarassumptionstosingleendedTRLRepeatabilityofconnector,launch,

and

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the abc of automatic fixture removal自动夹具拆卸基础知识.pptx