AN 766: Intel® Stratix® 10 Devices, High Speed Signal Interface Layout Design Guideline

ID 683132
Date 3/12/2019
Public
Document Table of Contents

Sweeping Void Width only on the First GND Plane Under the Capacitor

Keeping the via anti-pad radius fixed while adjusting the void width on the first GND plane under the AC capacitors also impacts the structure's impedance.

Figure 40. Differential Return Loss and TDR Impedance Performances for 0201 AC Capacitors by Various GND Cutout Widths

Changing the void width from 50 mil to 70 mil impacts the structure's impedance and return loss. A 55 mil void width is the optimum solution for this case and results in the least mismatching.

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