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Carrier Board PCB Layout Guidelines

6.4. Trace-Length Extensions Considerations

High speed differential signals need controlled impedance and according to the maximum loss

budget a controlled maximum trace length. In some systems the maximum trace length need to

be exceeded on the Carrier Board according to mechanical or system engineering reasons.

Trace-length extensions can be done with special signal conditioning chips from vendors like

Texas Instruments or Pericom, which are available for USB 3.0, SATA and PCIe.

Figure 73: Trace-length extension with signal conditioning chip

PICMG

COM Express

Carrier Board Design Guide Rev. 2.0 / December 6, 2013

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COM Express Module

COM Express Carrier Board

maximum allowed signal

trace length

signal conditioning chip

additional allowed

trace length

interface

jack

interface

cable

external device

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