[SI-LIST] Re: Beyond Rail Operation in IBIS
- From: Al Davis <aldavis@xxxxxxxx>
- To: Andrew.Ingraham@xxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 21 Oct 2002 14:29:11 -0600
On Monday 21 October 2002 09:58 am, Ingraham, Andrew wrote:
>
> .............. The slope of the I-V data is probably
> most important. Truncating the data means zero slope.
> Extrapolation is better. You want to be in the ballpark.
Truncating the data means that it is unknown there. Some
simulators use zero slope. Some extend the slope. There are
probably other methods. IBIS doesn't say what happens there.
If you want consistency, specify it.
Regarding the huge currents ......
If you use a Spice model that doesn't model the resistance of
the leads, you will get this. Real circuits have resistance in
the wires. This determines what slope to use when you
extrapolate the data.
You don't need a lot of points in this region. One point at 1
volt, and the next point at 5 volts should be good enough. A
straight line in this region is what you want. It's the
resistance of the wire.
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