Rachild,
I did not mean to say that the rise time was 1-2ps,
but rather that the absolute difference between the waveforms simulated with
an Ibis simulator and HSPICE was only 1-2ps. One does
not have to settle in IBIS for models with only a dV/dT. One can generate
(or receive from vendors) models which have extremely accurate
driving waveform shapes.
regards,
scott
Rachild Chen wrote:
> Scott,
>
> Which device's rising time is 1~2ps?How can you simulate by Hspice?How about the
> W-element work in this case?
>
> Rachild Chen
>
> Scott McMorrow wrote:
>
> > Roy,
> >
> > Roy Leventhal wrote:
> >
> > >
> > >
> > > But, I would guess that the 20% to 80% IBIS convention was chosen to fit in a
> > > more linear range of the I/O characteristics. I'm not sure that the choice has
> > > been a good one.
> > >
> > > Best Regards,
> > >
> > > Roy
> > >
> >
> > The 20% to 80% convention of IBIS is as good as any for getting
> > in the rough ballpark. However, since version 2.1 Ibis has
> > allowed the use of rising and falling waveform tables. One may
> > replicate the output edge response using this construct to any
> > desired degree of accuracy. Mine are often within 1 or 2 ps
> > of Hspice simulations.
> >
> > regards,
> >
> > scott
> >
> > --
> > Scott McMorrow
> > Principal Engineer
> > SiQual, Signal Quality Engineering
> > 18735 SW Boones Ferry Road
> > Tualatin, OR 97062-3090
> > (503) 885-1231
> > http://www.siqual.com
> >
> > ------------------------------------------------------------------------
> >
> > Scott McMorrow <[email protected]>
> > Principal Engineer
> > SiQual, Signal Quality Engineering
> >
> > Scott McMorrow
> > Principal Engineer <[email protected]>
> > SiQual, Signal Quality Engineering
> > 18735 SW Boones Ferry Road Work: 503-708-4320
> > Tualatin
> > OR
> > 97062-3090
> > USA
> > asdfsdaf
> > Additional Information:
> > Last Name McMorrow
> > First Name Scott
> > Version 2.1
-- Scott McMorrow Principal Engineer SiQual, Signal Quality Engineering 18735 SW Boones Ferry Road Tualatin, OR 97062-3090 (503) 885-1231 http://www.siqual.com
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--------------ED0E94BD692BCD6B539C0090--
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