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Mode Conversion Due to Residual Via Stubs in Differential Signaling
Publikationstyp
Conference Paper
Date Issued
2019-06
Sprache
English
Institut
TORE-URI
Article Number
8781665
Citation
IEEE 23rd Workshop on Signal and Power Integrity (SPI 2019)
Contribution to Conference
Publisher DOI
Scopus ID
Mode conversion is an important source of degradation in differential links, which can be induced by a trace length mismatch or asymmetric ground via configurations. This paper explores another source of mode conversion caused by asymmetric residual via stubs. These remnant via stubs can be present because of multiple reasons, such as residual stubs due to process tolerances or errors during back-drilling. Different via configurations have been analyzed through full-wave simulations. Results show a large impact on mode conversion with an increment of around -35 and -15 dB when the residual stub difference changes from 2 to 14 mil at the fundamental frequency of 17.5 GHz. Furthermore, an estimation approach of mode conversion as a function of via stub asymmetry is proposed.
Subjects
Back-drilling
differential signaling
mode conversion
printed circuit board
signal integrity
via stub