Issue link: https://iconnect007.uberflip.com/i/1028393
72 DESIGN007 MAGAZINE I SEPTEMBER 2018 The bottom line is that the possibility to sim- ulate a link in isolation from the rest of the board or localization is probably the most important condition to design predictable interconnects. Only structures with behavior predictable up to a target frequency should be used to design links for tens of Gbps data rates. The closeness of the stitching vias should be measured rela- tive to the wavelength—the stitching vias can be considered close, as long as the distance does not exceed a quarter of the wavelength at the target frequency. The number of stitching vias also matter. Without localization, the interconnects cannot be accurately simulated in most of the practi- cal cases. If interconnect behavior cannot be predicted, the outcome is uncertain. It may work, or it may fail! DESIGN007 Figure 8: How power propagates at different frequencies.