Issue link: https://iconnect007.uberflip.com/i/1176876
74 PCB007 MAGAZINE I OCTOBER 2019 simulation. Figure 12 in green shows the ref- erence transmission line without the tuned VeCS element, and Figure 13 in red the transmission line with a tuned VeCS layer transition (best fit/low-re- flection TDR). In Figure 14, we superim- posed the eye-diagram for the transmission line with- out VeCS (green) on the eye-diagram of the trans- mission line with the VeCS element (red). The eye is a bit more closed when using the VeCS; it is a marginal 0.516 V versus 0.539 V for the transmission line without VeCS. Details of the two eye-diagrams are listed in Table 2. Figure 12: Launch bit pattern. Figure 14: Super-imposed launch and exit eye pattern. Figure 13: Exit bit pattern. Table 2: Simulation performance data.