Subject: [IBIS-Users] Ramp and Rising waveform Load
From: Anshuli Goel (anshuli@india.ti.com)
Date: Thu Jan 16 2003 - 05:05:23 PST
Hello IBIS Gurus
While generating IBIS model I use 50 ohm as rload for calculation of
Ramp rate.
Should my rising and falling waveform also be generated for same load
fixture. ?
If I use 50 ohm as load fixture for rising and falling waveform ,the
voltage level in rising and falling waveform reaches only to maybe 50 %
of VDD.But when I use some high resistance as 500 ohm for load fixture
for rising and falling waveform (keeping Rload for ramp rate still as 50
ohm ) gives me waveform reaching to VDD. What is the best way to get
both ramp rate and rising and falling waveform ..
What significance does this Rload ( for ramp rate ) and R_fixture ( For
waveforms) hold ?
In case of simple I/O buffer what both these parameters define if
I think of physical entity of package and board ? What is the mean of
test structure the buffer is supposed to see ?
Regards
Anshuli
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