VC7 PCB Layout Guidelines Manual
R31UH0017EU0100 Rev.1.00
Aug 4, 2022
Page 10
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Keep both leads of a differential pair the same length so that signals arrive at the receiver at the same time.
Use “phase matching bumps” to the lead that is shorter than the other lead to make both signal leads the
same length. Remember to compensate at the end where length deficit takes place as shown below.
Figure 12. Adding Phase Compensation Bumps in a Differential Pair
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If ac-coupling capacitors are used, place the coupling capacitors in a way that the differential pair can be
routed symmetrically as shown below.
Figure 13. Symmetrical Placement of Series Components in a Differential Pair
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To avoid a non-related component on the board, avoid encompassing the component within the differential
pair. Rather route the differential pair away from the component together as in the following diagram.
Figure 14. Avoid Encompassing an Unrelated Component in a Differential Pair
