[SI-LIST] Re: Differential pair PCB Xtalk

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Sun, 21 Jul 2013 13:49:10 -0700

Your understanding is correct.


Steve.

On 7/21/2013 7:12 AM, Balaji G wrote:
> Hi all,
>      Although it is a basic question, I will be happy if I get a
> clarification. I heard people say tightly coupled differential pair is more
> robust to crosstalk. I am not sure up to what extent this is right in case
> of PCB. I believe, if the differential pair is robust to Xtalk, the noise
> should be coupled more or less same to both of the traces and rejected at
> receiver as it is a common mode component.  As Lee Ritchey pointed out in
> his one of the document,  Xtalk noise will couple more to near member of
> the diff pair and very less to the other member of diff pair from the
> aggressor . This will create a differential noise and it’s a problem. Then,
> differential pairs in PCB are not robust to Xtalk right?
>
> Regards,
> Balaji
>
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