Publisher DOI: 10.1109/SaPIW.2019.8781665
Title: Mode Conversion Due to Residual Via Stubs in Differential Signaling
Language: English
Authors: Cedeño-Chaves, Jonathan 
Scharff, Katharina 
Carmona-Cruz, Allan 
Brüns, Heinz-Dietrich 
Rimolo-Donadio, Renato 
Schuster, Christian 
Keywords: Back-drilling;differential signaling;mode conversion;printed circuit board;signal integrity;via stub
Issue Date: Jun-2019
Source: 2019 IEEE 23rd Workshop on Signal and Power Integrity, SPI 2019 - Proceedings (): 8781665 - (2019-06-01)
Abstract (english): 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.
Conference: IEEE 23rd Workshop on Signal and Power Integrity, SPI 2019 
ISBN: 978-153868342-2
Institute: Theoretische Elektrotechnik E-18 
Type: InProceedings (Aufsatz / Paper einer Konferenz etc.)
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