RE: [IBIS] Differential Buffer Modelling

Kong-Yew,
 
1)  You are correct.  You would use Idiff and Vdiff for the table
    in [Series Current].
2)  You should use the same response (except with negative polarity)
    for the cancellation that you will use in your final model.  If
    it was an [R Series], use a negative resistance, if it was [Series
    Current], use the same PWL table (with the signs reversed).
 
I hope this helps.
 
Arpad Muranyi
Intel Corporation
=======================================================================

________________________________

From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Kong Yew Chan
Sent: Monday, October 03, 2005 6:21 AM
To: ibis-users@eda.org; ibis@eda.org
Subject: [IBIS] Differential Buffer Modelling



IBIS Gurus,

 

I have some questions about generating differential buffer model as stated in latest Cookbook 4.0.

1)          My normalized differential mode current has a similar plot as shown in Pg 36. It's a function of the differential voltage, so that makes the usage of keyword [Series Current] appropriate in this case. To fill the I-V table, am I supposed to use the Vdiff vs Idiff ?

2)          For the V-T table data extraction, it was mentioned in Pg 40 that for [Series Current] keyword, PWL current source can be used to replace the R value. What should be the PWL response to represent the Idiff? (Idiff was only found to be a function of Vdiff from I-V extraction). 

 

Please advise if my assumptions are incorrect.  

 

Thanks

Kong-Yew


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