Comprehensive and Practical Way to Look at Far-End Crosstalk for Transmission Lines With Lossy Conductor and Dielectric

Far-end crosstalk (FEXT) noise is one of the major issues that limits signal integrity performance for high-speed digital products. It is important to estimate the crosstalk noise accurately to avoid noise margin failure or overdesigned transmission lines. Traditionally, analytical formulas for cros...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2020-04, Vol.62 (2), p.510-520
Main Authors: Yong, Shaohui, Khilkevich, Victor, Cai, Xiao-Ding, Sui, Chunchun, Sen, Bidyut, Fan, Jun
Format: Article
Language:English
Subjects:
Conductors
Crosstalk
Dielectric losses
Far-end crosstalk (FEXT)
High speed
lossy conductor
Modal analysis
Noise
Power transmission lines
Propagation losses
proximity effect
serializer/deserializer (SerDes)
Signal integrity
Stripline
Striplines
transmission line theory
Transmission lines
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Summary:Far-end crosstalk (FEXT) noise is one of the major issues that limits signal integrity performance for high-speed digital products. It is important to estimate the crosstalk noise accurately to avoid noise margin failure or overdesigned transmission lines. Traditionally, analytical formulas for crosstalk noise are based on lossless and perfect impedance match assumptions, which provide limited guidance for a practical high-speed transmission line design. A phenomenon is observed that a lossy conductor increases the FEXT on coupled striplines. To provide a reasonable explanation, analytical and numerical investigations were performed using a modal analysis based approach. A new FEXT component due to the lossy conductor is proposed. Such FEXT component is important to a high-speed stripline design because it is a major contributor when all terminals are matched. To estimate the impact of loss on FEXT, a practical and fast estimation approach is proposed.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2019.2902070