Common Glass Cloths Used In Pcb Manufacture; Inhomogeneous Nature Of A Pcb As Shown In This Cross-Section - Intel Quark SoC X1000 Design Manual

Figure 8.

Common Glass Cloths Used in PCB Manufacture

Note: Weave types above are for illustration purposes only
Figure 9.

Inhomogeneous Nature of a PCB as Shown in this Cross-Section

Note: Note the fiber weave bundle and epoxy regions
At high data rates this skew can amount to a substantial fraction of the transmission
unit interval, resulting in an increased common mode voltage and a correspondingly
degraded differential signal
(ACCM) can become a source of increased crosstalk and EMI in the system, or violate
receiver ACCM specifications.
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Intel Quark™ SoC X1000
PDG
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Intel Quark™ SoC X1000—Stack-Up and PCB Considerations
106 106 1080 1080
2116 2116 1652 1652
D -
Epox y only
Fiberglass
w eav e
bundle
(Figure 10). In addition, the resulting common mode signal
2113 2113
7628 7628
D +
June 2014
Order Number: 330258-002US