Intra-Pair Skew Metric, EIPS (Effective Intra-Pair Skew)

In the high-speed differential (HSD) interface design, the intra-pair skew becomes more critical as the link speed is ever increasing beyond 56Gbps+ signaling. The skew within a differential pair (intra-pair skew) deteriorates eye opening at the receiver and degrades the channel performance signific...

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Bibliographic Details
Published in2021 IEEE 25th Workshop on Signal and Power Integrity (SPI) pp. 1 - 4
Main Authors Moon, Se-Jung, Li, Jianting, Zhang, Xinjun, Kao, Chien-Ping, Lee, Beomtaek, Dsilva, Hansel, Guo, Jong-Ru
Format Conference Proceeding
LanguageEnglish
Published IEEE 10.05.2021
Subjects
backplane connector
cable
common-mode noise
Connectors
effective intra-pair skew
EIPS
Industries
intra-pair skew
Measurement
mode conversion
Optical signal processing
Receivers
Scattering parameters
skew
TDR
TDT
Time-domain analysis
VNA
weave effect
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Summary:In the high-speed differential (HSD) interface design, the intra-pair skew becomes more critical as the link speed is ever increasing beyond 56Gbps+ signaling. The skew within a differential pair (intra-pair skew) deteriorates eye opening at the receiver and degrades the channel performance significantly in HSD signaling. However, industry lacks in an accurate and stable intra-pair skew measurement methodology, which created a significant gap in interconnect testing and qualification. In this paper, the effective intra-pair skew (EIPS) is introduced, which is directly calculated from S-parameter data as a single value without time-domain conversion. The EIPS is verified by correlating to the eye opening and the common-mode noise (CMN) in the HSD link of PCIe Gen5 32Gbps NRZ signaling. The MATLAB script for the EIPS calculation is included in the appendix.
DOI:10.1109/SPI52361.2021.9505188