[SI-LIST] Re: IBIS & Cable

Powell,
You are correct. Many in most of the occasions, simulators tend to "assume"
the L, C and Z parameters of cables (also the delay through connector). And
the level of this accuracy actually is the measure of the accuracy and power
of the simulator.
Some Zuken simulators have a macromodel editor, which allows you to edit
these parameters and has many editable interconnecting options such as cable
thickness, cable gauge etc.,

Thanks,
Subramanya

----- Original Message -----
From: "Jon Powell" <jonpowell@xxxxxxxxxxxx>
To: <subramanya@xxxxxxxxxxxxx>; <ched_chang@xxxxxxxxxxx>
Cc: "SI List" <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, February 26, 2003 10:28 PM
Subject: RE: [SI-LIST] Re: IBIS & Cable


> I agree,
> Ibis was not intended (and has not been enhanced) to provide the proper
data
> for accurate modeling of connectors, small boards, or cables.
> For that sort of modeling you should research into the capabilities of
your
> simulator. Many times the problems with cable simulation will be centered
> around the simulators assumption of some existing perfect ground. (this is
> NOT true of all simulators so have to check out what yours is doing).
>
> jon
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Subramanya C K
> Sent: Wednesday, February 26, 2003 4:14 AM
> To: ched_chang@xxxxxxxxxxx
> Cc: SI List
> Subject: [SI-LIST] Re: IBIS & Cable
>
>
>
> Dear Chai,
> If I am correct, you are trying to simulate a system with cable connector
on
> the board feeding an external cable. In which case, it will not be proper
to
> define the Cable characteristics in the IBIS or EBD model of your feeder
> connector. This way of defining the connectors is known as Multi-line
> modeling- which has a few drawbacks such as pins of both connectors will
> have to be treated as pins of a single connector, so coupling between pins
> and coupling between cable and connector cannot be taken into
consideration
> (some times).
> Depending on your simulator, you can write a topology file which defines
the
> interconnection between the feeder and cable. And the interconnection
could
> be assigned with L and C parameters along with L, C and Z parameters of
the
> cable.
>
> Hope this will help.
>
> Regards,
> Subramanya
>
>
> ----- Original Message -----
> From: "Ched-Chang Chai" <ched_chang@xxxxxxxxxxx>
> To: <si-list@xxxxxxxxxxxxx>
> Sent: Wednesday, February 26, 2003 4:01 PM
> Subject: [SI-LIST] IBIS & Cable
>
>
> >
> > Dear all,
> >
> > If I have a board with a connector, which will be further connected to
> > another board through a cable.
> > Is it possible to include the cable electric characteristics (R,L,C, Zo,
> > length, etc) in the IBIS model?
> >
> > Thank you very much in advance.
> > --
> > Regards,
> > Chai
> >
> >
> >
> >
> >
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