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TUSB1002A: Minimum trace length required to avoid reflection

Roy Hsu
Genius 9350 points
Part Number: TUSB1002A

Hi Team,

I want to know what's the minimum trace length required from the host before the TUSB1002A to avoid reflection? Does 3 inch seem too short?

Thanks.

Roy

  • 0
    TI__Guru**** 166821 points

    Roy

    The unmatched impedance of transmission lines causes reflections as the impedance along the length of the transmission line changes. The  length of the trace is more associated with the insertion loss. 

    There are multiple factors that can contribute to the unmatched impedance of transmission lines. Some examples are:

    Wrong calculation of transmission line impedance

    Transmission line not having a solid ground reference plane

    Transmission line crosses split planes

    Transmission line goes through via.

    Thanks

    David

     

  • 0 in reply to David (ASIC) Liu
    TI__Genius 9350 points

    Hi David,

    Thanks for the comments!

    But let's assume the impedance is well matched but the trace length is very short, would't that cause reflection as well?

    If we can make the impedance as matched as possible, do you think 3 inches is OK? Or do you need more information to determine?

    Thanks.

    Roy Hsu

  • 0 in reply to Roy Hsu
    TI__Guru**** 166821 points

    Roy

    If the impedance is well matched, then 3in trace is OK. Is there a particular issue with the 3in trace?

    Thanks

    David