[SI-LIST] Re: Difference between coupling and crosstalk
- From: "Elya B. Joffe" <ebj@xxxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 02 Feb 2012 20:16:07 +0200
Actually, there is also common impedance (conductive coupling which
could be very dominant at lower frequencies (say below 100 kHz) due to
the common power and return planes...
Elya
On 01/02/2012 19:28, Dudi Tash wrote:
> Hi Pelle,
>
> Coupling is the mechanism that causes the crosstalk.
>
> There are two of those mechanisms. The first is capacitive coupling and the
> second is inductive coupling.
>
> The stronger the coupling, the stronger is the crosstalk, hence the incentive
> should be reducing the coupling mechanisms.
>
> In order to do that:
>
> 1. Separate the air gap between two (or more) adjacent traces
> 2. Reduce the distance between GND plane and trace signal (meaning reducing
> the controlled impedance)
> 3. Use slower (higher rise time) technologies as possible
> 4. Reduce the delta V of the signals as possible
> 5. Use differential pairs if possible
>
> Hope this helps
>
> Best Regards,
> Dgtronix Ltd. I Founder& CEO I Dudi Tash
> eFax: +972-3-7256490 I Mobile: +972-54-6345629 I Office: +972-9-9660967
> www.dgtronix-tech.com
>
>
>
>
>
>
> *This email contains confidential and proprietary information of Dgtronix
> Ltd.*
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Pehr Andersson
> Sent: Wednesday, February 01, 2012 7:17 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Difference between coupling and crosstalk
>
> Hello experts!
>
> What is the difference between coupling and crosstalk?
>
> * Crosstalk is dependent on the bit pattern. ?
> * Coupling is not dependent on the bit pattern. ?
>
> Can we then use coupling in frequency domain to get crosstalk, if the
> crosstalk is time-domain phenomena, that is, it is dependent on the bit
> pattern?
>
>
> For example if we want to estimate how much crosstalk we will receive on the
> victim line when having two aggressors with rise time 24ps and bit rate 10G,
> then we could use PSFEXT and PSNEXT for estimating FEXT and NEXT crosstalk.
> But will it tell me how much crosstalk I can expect, or how much it will
> close my eye?
>
> Thanks and best regards, Pelle
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