Subject: RE: [IBIS-Users] IBIS Question.
From: Jon Powell (jpowell@innoveda.com)
Date: Mon Mar 25 2002 - 09:54:59 PST
You should NOT be using different fixture voltages for RISING and
FALLING in most model cases.
You should be using 2 voltages and making two rising and two
falling waveforms.
For standard 5 volts CMOS you use:
50 ohms to 5 volts and
50 ohms to 0 volts
it is actually very important to the simulation math that you
have the same voltages in both sets of waveforms.
have fun
Jon Powell
> -----Original Message-----
> From: whiz kid [mailto:we_r_frendz@yahoo.com]
> Sent: Saturday, March 23, 2002 2:27 PM
> To: ibis-users@eda.org
> Subject: [IBIS-Users] IBIS Question.
>
>
> Hi folks,
> I have some dumb questions.
> 1) How can I identify the value of the pullup resistor
> being modeled by looking at the Pullup and the
> Powerclamp values.
> 2) Why do we need to use different fixture voltages
> when specifing the Rising and Falling waveforms.
>
> Any help is greatly appreciated.
>
> Thanks,
> Rahul.
>
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