RE: [IBIS-Users] Clamp graphs issue.

Kobi,

 

Is the Termination data contained in [Submodel] I-V curves?  Your IBIS
viewer program doesn't plot I-V data in Submodels.  You can look under
the [Model] keyword for something like the following:

 

[Add Submodel]

| Submodel Name        Mode

120ohm_ODT_1066         Non-Driving

 

Regards,

Randy

 

 

 

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Kobi Pinhas
Sent: Thursday, October 22, 2009 9:57 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] Clamp graphs issue.

 

Hi all.

I have some conceptual issue.

The next graph represents gnd clamp of an input model of a memory with
120 ohm ODT

This is model of a famous company which I download:

 

 

I don't understand how it is possible that the current is zero fot V>
-0.5V.

The meaning of ODT is resistor that connected from the input to the gnd.

So for this range (when V>-0.5V) I was expecting to see linear current
with a slope that equal to the resistor.

 

For example when I simulated gnd clamp of an input buffer with 50 ohm
ODT I received the next plot:

 

 

You can see that the plot is liner for V> -0.5V as expected.

I looked in a lot of ibis file and I never saw common behavior.

So I guess that maybe I am doing something wrong.

 

I will be glad to hear your comments.

 

Thanks a lot.

 

Kobi.


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