Scharff, KatharinaKatharinaScharffReuschel, TorstenTorstenReuschelDuan, XiaominXiaominDuanBrüns, Heinz-DietrichHeinz-DietrichBrünsSchuster, ChristianChristianSchuster2019-10-082019-10-082017-06-082017 IEEE 21st Workshop on Signal and Power Integrity, SPI 2017 - Proceedings: 7944020 (2017-06-07)http://hdl.handle.net/11420/3511The use of spectrally efficient line codings is an important factor to facilitate high bitrates. By using PAM4 and PAM8 instead of PAM2 line coding the bandwidth of the signal is reduced considerably. On printed circuit boards vias are a major cause of signal distortion. Especially via stubs lead to resonances that degrade the transmission. By using higher order line codings with a lower fundamental frequency it is possible to operate the channel at higher data rates by keeping the fundamental frequency away from the stub resonances. In this work an extensive study using eye diagrams of differential links with via stubs is conducted to investigate the correlation of stub length and signaling performance using different line codings. It can be shown that, if the fundamental frequency of PAM2 approaches the stub notch frequency, PAM4 and PAM8 will in general improve the eye openings.enTechnikConference Paper10.1109/SaPIW.2017.7944020Other