Wilder Technologies SATA 2.5 Test Adapter Dokumentacja Pobierz pdf (Strona 12)

SFF8639TestAdapterUserManual(Preliminary)

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Page|12

DocumentNo.910‐0034‐000Rev.A(Preliminary)

CalibrationThroughDe‐Embedding

TheSFF‐8639HostandDeviceTestAdaptersarefullypassivecomponents.Therefore,

calibrationcompensatingforthelossesmustoccurwithinthetestinstrumentationthatdrives

theSFF‐8639receiverorlooksattheresponseoftheSFF‐8639transmitter.

The8639‐TPAshaveTouchstoneS4Pfilesforde‐embeddingthe

electricallengthand

losseswithintheTPAuptotheSFF‐8639connectorinterfacepads.(ContactWilder

Technologies,support@wilder‐tech.com

,toobtainacopyoftheS4Pfiles.)TheTouchstoneS4P

filesenablethetestengineertocompensateforthelastfourofthefollowingsixrepeatable,

systematicerrorsthatoccurwhenmovingthereferenceplane:

 Signalleakageeffects:Directivityerrors

 Signalleakageeffects:Crosstalkerrors

 Reflectioneffects:

SourceImpedanceMismatchingerrors

 Reflectioneffects:LoadImpedanceMismatchingerrors

 Bandwidtheffects:ReceiverTransmissioninTestEquipmenterrors

 Bandwidtheffects:ReceiverReflection‐trackinginTestEquipmenterrors

Theseerrorsarecorrectedoneachport.RefertotheInstrumentManualforinstructionson

theinstrument’sspecificde‐embedding

process.

NOTE:Thereferenceplaneistheboundary,bothphysicallyand

electrically,betweenthecalibratedandun‐calibratedportionsof

thecircuit.Everythingoutsidethereferenceplaneisconsidered

partoftheDUT.Anyinstrumentthatdoesnotusecalibrationorde‐

embeddingofthetestfixturedefinestheDUTasthetotalof

externallyconnectedcomponents.Ifthede‐embeddingfile

isnot

used,allofthe8639‐TPAandassociatedcoaxialcables,aswellas

cablesconnectingtheTPAassemblytothetestinstrument,wouldbe

apartoftheDUT.

Non‐repeatableerrors,suchasdriftorrandomerrors,canbereducedbutnotcorrected.

Drifterrorsaggregateovertimeorwithenvironmentalchangessuchastemperatureshift.To

eliminatedrifterrors,performaninstrumentation‐levelcalibration.

Arandomerrorcannotbecorrectedthroughcalibrationsincetheerroroccurredrandomly.

Random

errorsaretypicallyassociatedwitheithertestinstrumentnoiseortestrepeatability

problems.Reducetestinstrumentnoisebyincreasingsourcepower,loweringtheIF

bandwidth,oraveragingresultsovermultiplesweeps.Reducetestrepeatabilityproblems

throughtheuseofatorquewrenchor,again,byaveragingovermultiplesweeps.

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