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ModeTransformations in Differential Interconnects Simbeor …在差分模式的转换——simbeor互连….ppt

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ModeTransformations in Differential Interconnects Simbeor …在差分模式的转换——simbeor互连…

? 2009 Simberian Inc. ? 2009 Simberian Inc. Primer on Mixed-Mode Transformations in Differential Interconnects DesignCon IBIS Summit, Santa Clara, February 5, 2008 Copyright ? 2009 by Simberian Inc. Reuse by written permission only. All rights reserved. Yuriy Shlepnev shlepnev@ Agenda Introduction Mixed-mode transformations and geometrical symmetry Double micro-strip line bend Investigation of micro-strip channel with two reversed bends in frequency and time domain Experimental validation Possible ways to minimize the mode transformation Conclusion * ? 2009 Simberian Inc. * * ? 2009 Simberian Inc. * Introduction Transformation from differential to common modes is unwanted effect in differential interconnects Common mode may cause differential signal degradation (skew) and electromagnetic emission Transformation usually takes place at bends and non-symmetrical routing near via-holes The most accurate way to quantify the effect is in the frequency domain with S-parameters in the mixed-mode space In case of bends the transformation effect can be simulated with the local electromagnetic analysis This presentation contains some practical observations on the estimation and minimization of the mode transformation effect Experimental validation provided by Teraspeed Consulting Group Simbeor 2008 software has been used for all computations Mode transformation in reciprocal 4-port See details in D.E. Bockelman, W.R. Eisenstadt, Combined differential and common-mode scattering parameters: Theory and simulation, IEEE Trans. on MTT, vol. 43, 1995, N7, p. 1530-1539 * ? 2009 Simberian Inc. * 2 1 3 4 C1 D1 D2 C2 [S] [Smm] Mode Transformation Terms: Terminal space Mixed-mode space All S-matrices are symmetrical (S[i,j]=S[j,i]) due to reciprocity property (if only isotropic materials used to manufacture interconnects) - congruent transformation preserves matrix symmetry Mixed-Mode Terminology Block DC describes modal transformations or conversion (highlighted blocks of the mixed-mo