[IBIS] RE: On-die decap modeling in IBIS 5.1

Hi Rinsha,

For Micron's power-aware IBIS models, I've chosen to include a separate Spice subcircuit for the on-die decoupling.  The model user is then expected to hook this model up in simulation.  The reason for that is I wanted to include a frequency dependent model more complex than a simple RC series model.  So, I use HSPICE to characterize the on-die decoupling in an S-parameter sweep.  Then, I convert the S-parameter into a broadband-Spice model.

I have an example of this that is publicly available for download.  The model is for an LPDDR2 memory device and can be found at: http://www.micron.com/~/media/Documents/Products/Sim%20Model/DRAM/LPDDR2/u80m_ibis.zip.

Let me know if you have further questions.

Regards,
Randy

From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Rinsha Reghunath
Sent: Thursday, July 11, 2013 10:17 AM
To: Muranyi, Arpad; ibis-users@eda.org; ibis@eda.org
Subject: [IBIS] RE: On-die decap modeling in IBIS 5.1

Hi Arpad,


Thanks for your reply.



As I mentioned in my first mail, I have read about using "Series" model type and [Series Pin Mapping] keyword to model decoupling circuit. I also referred "Modeling the On-die De-cap of IBIS 5.0 PDN-aware Buffers by Lance Wang and Randy Wolff, IBIS Summit (Taipei) Nov. 21st, 2011" wherein it has mentioned the problem in this approach. So wanted to confirm if Series model is the option being used for the same, which is now clear from your reply.



Thanks,

Rinsha

From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Muranyi, Arpad
Sent: Thursday, July 11, 2013 7:39 PM
To: ibis-users@eda.org; ibis@eda.org
Subject: [IBIS] RE: On-die decap modeling in IBIS 5.1

Rinsha,

Did you read the section on [Composite Current] in the IBIS
specification?  There is some mention in there about this
topic (around pg. 70 in the v5.1 PDF file).  It basically
boils down to use the series models between power and ground,
optionally with [Pin Mapping] for more detail.

Please ask your questions in a more specific way, because if
your questions are general, people are not going to start
writing books in emails to explain everything you might be
interested in about IBIS...

I hope this helps,

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


From: owner-ibis@eda.org<mailto:owner-ibis@eda.org> [mailto:owner-ibis@eda.org] On Behalf Of Rinsha Reghunath
Sent: Thursday, July 11, 2013 4:25 AM
To: ibis-users@eda.org<mailto:ibis-users@eda.org>; ibis@eda.org<mailto:ibis@eda.org>
Subject: [IBIS] RE: On-die decap modeling in IBIS 5.1

Hello all,

I would like to understand about on-die decap modeling in IBIS 5.1 models and how PDN analysis is done using the same. Any help would be appreciated.

Thanks,
Rinsha

From: owner-ibis-users@eda.org<mailto:owner-ibis-users@eda.org> [mailto:owner-ibis-users@eda.org] On Behalf Of Rinsha Reghunath
Sent: Monday, July 08, 2013 2:41 PM
To: ibis-users@eda.org<mailto:ibis-users@eda.org>; ibis@eda.org<mailto:ibis@eda.org>
Subject: [IBIS-Users] On-die decap modeling in IBIS 5.1

Hi all,

How do we model RC on-die decap in IBIS 5.1 models?

I read about using "Series" model type and [Series Pin Mapping] keyword to model decoupling circuit, but would like to understand more about the same. Please guide with reference materials or explanations.

Thanks,
Rinsha

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