Subject: [IBIS-Users] RE: ibis question
From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Fri Jan 24 2003 - 08:38:22 PST
Siva,
These two input models are going to act the same way exactly. The
clamp curves and C_comp seem to be identical. The fact that the
supply voltage is different will not make any difference in the
simulation with these models because there is no power clamp curve
in them. (If there was one, you would see a difference in waveforms
that go over the supply voltage, one receiver would start clamping
at the lower supply while the other at the higher supply voltage).
Arpad
====================================================================
-----Original Message-----
From: Sivakumar S. - CTD, Chennai. [mailto:sivakumar@ctd.hcltech.com]
Sent: Thursday, January 23, 2003 9:49 PM
To: ibis-users@eda.org
Cc: Muranyi, Arpad
Subject: ibis question
IBIS Gurus,
I have a ibis model with the following inputs
INPUT1,INPUT2.When I compare these two inputs, there is no difference except
the [Voltage Range].I would like to know whether these will have similar
characteristics and behaviour or not?.Could anybody please give me some
explanation?.I have checked these two INPUTs in the hyperlynx ibis editor
and captured waveform and attached waveform for your reference.
And also in some IBIS models, I found that the input buffers are
defined with POWER_CLAMP and GND_CLAMP .But this model is having only
GND_CLAMP defined. What will be the effect? could anybody explain me?
[Model] INPUT1
Model_type Input
Vinl = 0.75v
Vinh = 1.75v
| variable typ min max
C_comp 2.0pF 1.5pF 2.5pF
|
|variable typ min max
[Temperature Range] 50 0 100
|
|variable typ min max
[Voltage Range] 2.5 2.375 2.7
|
[GND Clamp]
|voltage typ min max
0 0 NA NA
-0.3 0 NA NA
-0.4 -0.05m NA NA
-0.5 -0.5m NA NA
-0.55 -1.3m NA NA
-0.6 -2.6m NA NA
-0.65 -4.4m NA NA
-0.7 -6.8m NA NA
-0.75 -9.6m NA NA
-0.8 -13.7m NA NA
-0.9 -26.0m NA NA
-1.0 -42.5m NA NA
-1.2 -81.5m NA NA
-1.5 -145.1m NA NA
-1.8 -212.6m NA NA
-2.1 -279.1m NA NA
-2.4 -344.8m NA NA
-2.7 -415.5m NA NA
-3.0 -480.1m NA NA
[Model] INPUT2
Model_type Input
Vinl = 0.75v
Vinh = 1.75v
| variable typ min max
C_comp 2.0pF 1.5pF 2.5pF
|
|variable typ min max
[Temperature Range] 50 0 100
|
|variable typ min max
[Voltage Range] 3.3 3.135 3.6
|
[GND Clamp]
|voltage typ min max
0 0 NA NA
-0.3 0 NA NA
-0.4 -0.05m NA NA
-0.5 -0.5m NA NA
-0.55 -1.3m NA NA
-0.6 -2.6m NA NA
-0.65 -4.4m NA NA
-0.7 -6.8m NA NA
-0.75 -9.6m NA NA
-0.8 -13.7m NA NA
-0.9 -26.0m NA NA
-1.0 -42.5m NA NA
-1.2 -81.5m NA NA
-1.5 -145.1m NA NA
-1.8 -212.6m NA NA
-2.1 -279.1m NA NA
-2.4 -344.8m NA NA
-2.7 -415.5m NA NA
-3.0 -480.1m NA NA
Your comments are greatly appreciated.
regards
siva
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