[SI-LIST] Re: Measuring Crosstalk
- From: Bob Patel <whizplayer@xxxxxxxxx>
- To: jonpowell@xxxxxxxxxxxx, chandaharitha@xxxxxxxxx,si-list@xxxxxxxxxxxxx
- Date: Thu, 10 Jul 2003 15:30:43 -0700 (PDT)
Hi!
The way I have done it in simulations using Hspice is:
1)Extract RLGC for the coupled pair i.e. Victim &
aggressor using geometry in concern.
2)Now drive the Aggressor with a pulse of rise & fall
& amplitude which represents the actual signal on
board and hold the victim low.
3)Now, look at the near end & far end crosstalk on the
victim using a waveform viewer.
4)You can also run random pattern and look at the EYE
when both are switching and you will see what
crosstalk does to each line.
If you want to measure in lab, then there are various
ways like using TDR or scope.
Bob
--- Jon Powell <jonpowell@xxxxxxxxxxxx> wrote:
> When simulating something like this, the normal
> method is to stimulate the
> aggressor and measure the change from DC (in high
> and low state) at the
> receivers on the victim line. If there are more than
> one aggressor (a usual
> case) then the crosstalk is usually added up for a
> worst case number.
> If you know something about the realtive timing of
> the signals (usually from
> info from a static timing engine or hand entered)
> many SI simulators can do
> addtional processing to ignore crosstalk that does
> not occur during the data
> transmission window of the victim.
>
> Note that this method ends up with a worst-case
> scenario that is usually
> much worse that the actual cross-talk. To do better
> you need to know the
> complete information about the relative timing of
> the signals and simulate
> the entire coupled arrangement together and observe
> differences. (I wouldn't
> do this unless the worst-case exceeded my crosstalk
> budget).
>
> jon
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of
> chandaharitha
> Sent: Thursday, July 10, 2003 12:08 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Measuring Crosstalk
>
>
>
> Hi
>
> Basically I would like to know how would they
> measure crosstalk .
>
> If there are only two lines , one is aggressor and
> the the other
> quiet or victim line, how do we measure crosstalk?
>
> What are the standard procedures?
>
> Thanks
> Haritha
>
>
>
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