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MicroZed Hardware Design Standard MicroZed Signal Trace Width/Spacing.
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Related

Standard MicroZed Signal Trace Width/Spacing.

Former Member
Former Member over 7 years ago

After reviewing the needed info in the Netlist, I looked into both the MicroZed Hardware Guide as well as the Carrier Design Guide but could not seem to find this info.

Of course precise adjustments will need to be made depending on how the signals are routed on the carrier board (internal/external, etc), but just as a 'starting point' or rule of thumb I am wondering what the signalling trace width is on the MicroZed board itself (note, I am only concerned with the signal traces alone that feed out to JX1/JX2, not power, etc).

I do see in the Carrier Design Guide that 4x spacing is recommended, but I am wondering just what trace width I ought to 'at least' be starting out with for routing out my signals, and then work from there.

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  • zedhed
    0 zedhed over 7 years ago

    Hi abalducci,

    I think the trace width numbers normally come from your PCB shop and are depended upon the target impedance for the PCB stackup that you are using for your carrier board.  That stackup is heavily dependent upon the complexity of your carrier design.

    For example, our PicoZed FMC Carrier has the following stackup:

     

    Top

    Ground

    Signal

    Signal

    Power

    Power

    Signal

    Signal

    Ground

    Bottom

     

    For 50-Ohm outer single ended signals, the trace width is 5 mils.  For 50-Ohm inner single ended signals, the trace width is 4.5mils.

    For 100-Ohm differential signals all layers, the trace width is 4 mils with 10 mil spacing. 

    Are you in contact with your local Avnet/Silica FAE on this project?

     

    Regards,

    -Kevin

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  • Former Member
    0 Former Member over 7 years ago in reply to zedhed

    Dear Kevin,

    Yes you are correct about there being specialized requirements based on the board shop, but this at least gives me a very useful guideline (i.e. traces no smaller than) to start with. Thanks for the info.

    Best,
    - Anthony

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  • Former Member
    0 Former Member over 7 years ago in reply to zedhed

    Dear Kevin,

    Yes you are correct about there being specialized requirements based on the board shop, but this at least gives me a very useful guideline (i.e. traces no smaller than) to start with. Thanks for the info.

    Best,
    - Anthony

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