RE: [IBIS-Users] differential receiver ibis model

Hi, Raghavendra,
FYI.

You can use another method for fully differential pair driver/receiver IBIS
modeling. The idea is to focus on the pin pair of the differential model and
embedded the current between the pins into native IBIS I-V curves. 

This method brings easy to model, accurate and almost no limits for the all
the types of differential pair buffers (true, half and pseudo, symmetrical
or not, etc.). And it is fully compatible with all IBIS simulators. (it only
uses native IBIS curves - pullup, pulldown, power clamp and ground clamps)

It has been implemented into our modeling tool and it is used by the
industry professionals now. The feedback is very positive so far.

I have a paper accepted by EMC Compo 2009 in Nov, 2009. (you will need to
wait for few more months) and planned to give a presentation in DesignCon
2010 about it. 

You can send me private emails about this method and tools for more details.

Hope this helps,

Lance Wang
IO Methodology Inc.
www.iometh.com



-----Original Message-----
From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org] On Behalf Of Raghavendra M
Sent: Thursday, September 10, 2009 1:17 AM
To: ibis-users@server.eda.org
Subject: [IBIS-Users] differential receiver ibis model

Hi,

I have a fully differential receiver in a chip, am trying to make an 
ibis model for this receiver
Can you describe the method how to generate an ibis v3 model for the 
differential receiver
I read the ibis cookbook and it says that for a differential buffer with 
positive and negative inputs,
one input should be swept keeping the other input constant(negative) and 
record the currents into both inputs.
Now change the constant input to new value and sweep the positive input 
and record the currents.
This process should be continued as the negative input is swept in steps 
through the  same range  as positive input.
 From the current recorded we have to separate common mode and 
differential mode currents.
But my question is where should we keep this common mode and 
differential mode currents in the ibis file?
Actually for receiver, only clamp data should be kept in ibis file, so 
in [Power clamp] data where should we keep
common mode current and differential mode current

Should i use series model for my differential receiver?
Should we place these characteristics in the model series?
Is there any tool to generate an ibis model for differential receiver 
directly?

Thanks & Regards
Raghavendra M


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