Subject: RE: [IBIS-Users] C_comp issue?
From: Ingraham, Andrew (Andrew.Ingraham@hp.com)
Date: Tue Nov 12 2002 - 06:07:07 PST
> I think we also agree that when we simulate with a particular
> IBIS model, then no matter what the C_comp parameter says, the
> output should reproduce the same waveforms when the model is
> driving and no reflections are present.
On a purely theoretical level, surely there are limits to that.
You should not be able to increase C_comp without bounds and
still have the same waveforms. The V-T waveforms, C_comp, and
the transistor drive strengths (from their I-V curves) ought to be a
consistent family, and stressing one of them while not changing
the others, eventually hits a wall.
Even if you don't stress it that far to make the algorithms break,
there's no guarantee that the waveforms wouldn't be affected by
even small changes in C_comp, when the load is anything other
than R_fixture to V_fixture.
Regards,
Andy
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