RE: [IBIS-Users] true differential buffer IBIS modelling

Shivani,


1)  Yes.

2)  Look at the 3D surface of Idiff, as shown in fig. 4.16 on

pg. 36 in the IBIS cookbook http://www.eda.org/ibis/cookbook/cookbook-v4.pdf.


If the surface is flat, i.e. its edges are straight you have

a linear (resistive) differential current.  (It doesn’t have

to be horizontal, but it should not have a curvature to it in

any direction).  In this case you can use [R Series].  If there

is a curvature in one or two directions, you will need to use

[Series Current] or [Series MOSFET].  We do not model reactive

characteristics with I-V curves, so L and C doesn’t come into

this picture.

3)  Vds is the voltage between the non-inverting and inverting terminals

of the buffer.  Look at pg. 51 in the IBIS Cookbook to see the

explanation for Vtable.

4)  Sorry, I do not have an example for you.

I hope this helps.

Arpad
===========================================================================



From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Shivani Sharma
Sent: Thursday, September 18, 2014 4:04 AM
To: ibis-users@eda.org
Cc: mikelabonte@eda-stds.org
Subject: [IBIS-Users] true differential buffer IBIS modelling

Hi all

i have a couple of queries related to IBIS modelling of truely differential buffers

Please see-> http://www.shivanis14.blogspot.in/


Thanks
Shivani


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