RE: [IBIS-Users] Usage of [Series Current]

The series models below do appear to be equivalent. Voltage on series
models is measured from pin 1 to pin 2 of the [Series Pin Mapping]
entry, and currents into pin 2 would be negative. It should not be
necessary, but it may help to extend the table voltage range all the way
from -1.2V to +2.4V.
 
In my opinion it is quite likely that there could be issues with some
[Series Current] implementations, and the various tools may behave
differently. If you are an IC vendor you could submit your IBIS file to
the free model review service, where it will be examined and tested by
EDA tool vendors and other experts.
 
http://www.eigroup.org/ibis/support.htm
 
Or you could report the problem to the vendor you are using.
 
Mike

________________________________

From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org] On Behalf Of Edward Rose
Sent: Monday, September 14, 2009 6:27 AM
To: ibis-users@server.eda.org; ibis@server.eda.org
Subject: [IBIS-Users] Usage of [Series Current]


Hello Experts,
 
I am trying to use [Series Current] keyword instead of [R series] in a
Series model as given below.
 
 
|**********************************************************************
[Model]  SER_RES
Model_type  Series
Polarity  Non-Inverting
Enable  Active-High
C_comp  0pF  0pF  0pF
|
|  typ  min  max
[Voltage Range] 1.2V 1.08V 1.32V
|
| variable R(typ) R(min) R(max)
|
|[R Series] 100ohm  NA  NA
|
[End]

|**********************************************************************
|
[Model]  SER_CURR
Model_type  Series
Polarity  Non-Inverting
|Enable  Active-High
C_comp  0pF  0pF  0pF
|
|  typ  min  max
[Voltage Range] 1.2V 1.08V 1.32V
|
[Series Current]
| Voltage I(typ)    I(min)    I(max)
   0.00V   0.0A      NA  NA
   0.10V  -1.0mA   NA  NA
   0.20V  -2.0mA   NA  NA
   0.30V  -3.0mA   NA  NA
   0.40V  -4.0mA   NA  NA
   0.50V  -5.0mA   NA  NA
   0.60V  -6.0mA   NA  NA
   0.70V  -7.0mA   NA  NA
   0.80V  -8.0mA   NA  NA
   0.90V  -9.0mA   NA  NA
   1.00V  -10.0mA  NA  NA
   1.10V  -11.0mA  NA  NA
   1.20V  -12.0mA  NA  NA
|
[End]
|*****************************************************
 
According to understanding from IBIS specification document,  both above
given models should be identical.
But, during simulation I am getting different results. 
Series model with only [R series] is giving desirable result while model
with only [Series current] giving totally different results
 
Am I doing something wrong or there is some problem with my simulator???
 
Thanks in advance
Edward
 
 
 

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