Re: [IBIS-Users] full differential buffer IBIS modeling ---clarification

Saravanan,
The first, s2ibis3 can be used for simple single-end buffer only. It might
not be satisfied for differential buffers.

The second, R_load in s2i is the same as R_fixture in the IBIS file.

The third, full/true differential pair buffer IBIS extraction will not be
handled by s2ibis3 correctly. Another word, you will never be able to get
correct IBIS models thru s2ibis3 for your full differential buffers.

Hope this helps.
 
Lance Wang
IO Methodology Inc.
978-266-8981

SimDE MODEL, the best IBIS modeling tool in the market.
http://www.iometh.com





From:  Saravanan Ganesh <Saravanan.Ganesh@onsemi.com>
Date:  Friday, May 9, 2014 at 9:55 AM
To:  "ibis-users@eda.org" <ibis-users@eda.org>
Subject:  [IBIS-Users] full differential buffer IBIS modeling
---clarification

> Hi 
> I want to  brief on the R_load  I am using
>  
> I am creating  IBIS model (Version 3.2) of a full differential buffer .
> I have also  connected the termination shown in ³diffbuff_termination.png² in
> differential buffer schematic.
>  
> Even though I have connected the required termination in schematic itself ,
> the .s2i file need R_load value to be supplied.
> Therefore I have used a High value resistor (R_load=100G ohm) in .s2i file.
>  
> Hyperlinx ³Check file for IBIS spec conformance²  gives following  error Š
>  
> ERROR: Model OUTPUT_DIF: The [Rising Waveform]
>       with [R_fixture]=1e+011 Ohms and [V_fixture_max]=0.22V
>       has MAX column DC endpoints of  0.08V and  0.31v, but
>       an equivalent load applied to the model's I-V tables yields
>       different voltages ( 0.08V and  0.35V),
>       a difference of  0.01% and 16.09%, respectively.
>  
> What could be wrong? What can I do to get rid of these errors and warnings?
>  
> Please mail me if any more clarification required ,Waiting for your replies.
> Thanks and regards
> Saravanan.G
>  
>  
> 
> From: Saravanan Ganesh
> Sent: Thursday, May 08, 2014 8:04 PM
> To: 'ibis-users@eda.org'
> Subject: full differential buffer IBIS modeling
>  
> Hi 
> I am creating  IBIS model (Version 3.2) of a full differential buffer .
> I have also  connected the termination shown in ³diffbuff_termination.png² in
> differential buffer schematic. Therefore  I took R_load = 100G ohm in .s2i
> file, so that only load in schematic are effective.
> Hyperlinx ³Check file for IBIS spec conformance²  gives following  error Š
>  
> ERROR: Model OUTPUT_DIF: The [Rising Waveform]
>       with [R_fixture]=1e+011 Ohms and [V_fixture_max]=0.22V
>       has MAX column DC endpoints of  0.08V and  0.31v, but
>       an equivalent load applied to the model's I-V tables yields
>       different voltages ( 0.08V and  0.35V),
>       a difference of  0.01% and 16.09%, respectively.
>  
> What could be wrong? What can I do to get rid of these errors and warnings?
>  
> Thanks and regards
> Saravanan.G
> 
> -- 
> This message has been scanned for viruses and
> dangerous content by MailScanner <http://www.mailscanner.info/> , and is
> believed to be clean.



-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.




--------------------------------------------------------------------
|For help or to subscribe/unsubscribe, e-mail mikelabonte@eda-stds.org
|or ibis-request@eda-stds.org
|
|IBIS reflector archives exist under:
|
|  http://www.eda-stds.org/ibis/email_archive/ Recent
|  http://www.eda-stds.org/ibis/users_archive/ Recent
|  http://www.eda-stds.org/ibis/email/         E-mail since 1993