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Differential-Line Characterization Using Mixed-Port Scattering Parameters

: Engin, A.E.; Ndip, I.; Lang, K.-D.; Aguirre, J.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Microwave Theory and Techniques Society:
IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization, NEMO 2018 : 8-10 August 2018, Reykjavik, Iceland
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-5204-6
ISBN: 978-1-5386-5203-9
ISBN: 978-1-5386-5205-3
International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) <5, 2018, Reykjavik>
Conference Paper
Fraunhofer IZM ()

High-speed transmission lines are commonly routed as differential lines to control sensitivity to noise on the reference planes at higher speeds. Differential lines are typically characterized in terms of mixed-mode scattering parameters, as they provide insight into the behavior of differential and common signals, as well as the mode conversion among them. These mixed-mode scattering parameters can be mathematically obtained from single-ended parameters, which can for example be measured with a 4-port vector network analyzer. There has been recent efforts to develop extended or modified versions of mixed-mode scattering parameters, especially for tightly-coupled lines. This can be a point of confusion in interpreting the behavior of differential lines. In this paper we introduce the mixed-port scattering parameters, which do not suffer from any such ambiguous definitions. Mixed-port scattering parameters are defined based on common and differential port excitations, allowing a simpler interpretation than their mixed-mode counterparts, without the need for defining even, odd, common, or differential-mode impedances. As such, mixed-port scattering parameters can be used to analyze the performance of a general differential network, certainly including coupled or asymmetrical lines, without any ambiguity.