Design of Suppressing Crosstalk by Vias of Serpentine Guard Trace

Abstract

The design of the serpentine guard trace (SGT) in the literal is to add two termi- nally matching resistances on the serpentine guard trace. Although this approach can get more layout space and suppress far-end crosstalk, it neglects the interference of near-end crosstalk. Therefore, we propose an approach, namely \vias of serpentine guard trace (VSGT), which the grounded-vias are added on the guard trace by a proper location and the ratio between the length of the horizontal and vertical on the guard trace can be adjusted in a better state such that the near-end crosstalk (NEXT) and far-end crosstalk (FEXT) coe-cient will be minimum and get the better performance. Hence, our proposed approach can simultaneously suppress NEXT and FEXT. Verifled in the frequency-domain simulation results, our approach, VSGT, can improve not only NEXT by 3.7 and 0.83dB but also FEXT by 5.11 and 0.1dB compared to the three- width rule and SGT, respectively. Moreover, verifled in the time-domain, VSGT can reduce not only NEXT by 34.67 and 27.5% but also FEXT by 46.78 and 6.91% than that of the three-width rule and SGT, respectively.