AW: [IBIS-Users] ibischk4

Hello Andy,

I think I can take the ramp as a linear 2 point-waveform.

e.g.
vcc = 3.3V
dV_dt_r = 0.6V/0.6ns
dV_dt_f = 0.6V/0.6ns

dV_dt_r is defined as 50 Ohms to gnd and is the 20-80%-value
=> the starting voltage-point is 0V
0.6V is 60% of the whole swing => 0.6V/0.6 = 1V is the whole
100% swing

=> u(t)_rising
0.0ns 0.0V
0.2ns 0.2V
0.8ns 0.8V
1.0ns 1.0V

of course I do not know if the waveform is shifted somehow on
the t-axis.

dV_dt_f is defined as 50 Ohms to vcc and is 20-80%-value
=> the starting voltage-point is vcc = 3.3V

same procedure.

0.0ns 3.3V
0.2ns 3.1V
0.8ns 2.5V
1.0ns 2.3V

Do you think this is reasonable or not?

Regards,
Katja

> > -----Ursprüngliche Nachricht-----
> > Von: Andrew Ingraham [mailto:a.ingraham@ieee.org]
> > Gesendet: Mittwoch, 3. November 2004 15:56
> > An: Koller Katja; ibis-users@eda.org
> > Betreff: Re: [IBIS-Users] ibischk4
> >
> >
> > > does someone know if the ibischk4 checks if the static and
> > > dynamic curves fit together, when I have only a ramp for
> > > dynamic information?
> >
> > I think I don't understand the question. If you have only
> > Ramp data, you
> > have no dynamic (V-T) curves, so there's nothing to check.
> >
> > Ramp data is essentially independent of I-V characteristics.
> >
> > Regards,
> > Andy
> >
> >
>

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Received on Wed Nov 3 09:50:48 2004