Transcription of Considerations for PCB Layout and Impedance …
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Considerations for PCB Layout and Impedance …
ApplicationReportSLLA311 (TOSAs)andlaserdriversmayhavedifferentre sistancesina givenapplication,sothereflectioncouldbew orseif (PCB) mismatchedtraceandnon-terminatedTOSA, February2011 ConsiderationsforPCBL ayoutandImpedanceMatchingDesignin OpticalModulesSubmitDocumentationFeedbac k 2011,TexasInstrumentsIncorporatedROSATOS AMCUPost Amp (PA)Laser , ,impedancematchingis ,opticalmodulesareanapplicationwithsever alconstrainingfactors:frequencyoverGbps; variationsin thelaserdrivermodel;theactualtransmissio nlines;and,mostimportantly, result,evenwithgoodmodelstopredicttheope ratingconditionswithrelativeaccuracy, thisdocument,impedancemismatchresultsin 10-Gdirectmodulaterlaser(DML) (TOSA)in (ROSA)elementsAtpoint2,thereflectionis ,thereflectionsarea ,a portionofthetransmittedsignalisreflected backtowardsthesignalsource,andit canpropagatebackandforthin thetraceuntilit , thereflectedenergyis toohigh, OpticalSLLA311 February2011 ModulesSubmitDocumentationFeedback 2011,TexasInstrumentsIncorporatedGL=VVRE FLIN=ZZZ + ZL0L0-RM17W22 is definedasshownin Equation1:(1)Inthisequation,Z0is thetransmissionlineimpedance;thisfactori s usuallya constantwithanindustrynormalizedvaluesuc has50 or100.
G L = V V REFL IN = Z Z Z + Z L 0 L 0-R M 17 W 22 Hm MPD DFB www.ti.com Impedance Transfer Circuit Considerations 2 Impedance Transfer Circuit Considerations It is well known that the amount of reflected signal from …
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