PI3DPX1203

A product Line of

Diodes Incorporated

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www.diodes.com

February 2021

© Diodes Incorporated

PI3DPX1203

Document number DS40598 Rev 2-2

Figure 7-5 Stitching Capacitor Placement

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To keep the reference unchanged, stitching vias must be used when changing layers.

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Differential pair should maintain symmetrical routing whenever possible. The intra-pair skew of micro-strip should be less than

5 mils.

•

To keep the reference unchanged, stitching vias must be used when changing layers.

•

Differential pair should maintain symmetrical routing whenever possible. The intra-pair skew of micro-strip should be less than

5 mils.

Figure 7-6 Layout Guidance of Matched Differential Pair

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For minimal crosstalk, inter-pair spacing between two differential micro-strip pairs should be at least 20 mils or 4 times the dielec-

tric thickness of the PCB.

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Wider trace width of each differential pair is recommended in order to minimize the loss, especially for long routing. More consis-

tent PCB impedance can be achieved by a PCB vendor if trace is wider.

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Differential signals should be routed away from noise sources and other switching signals on the printed circuit board.

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To minimize signal loss and jitter, tight bend is not recommended. All angles α should be at least 135 degrees. The inner air gap A

should be at least 4 times the dielectric thickness of the PCB.