RE: [IBIS-Users] Test case to see the sensitivity of split C_comp values

Sam,

Thanks for the test case and the pointer.

I will proceed with this test case.

Best Regards,
Venu

-----Original Message-----
From: Sam Chitwood [mailto:samchitwood@sigrity.com] 
Sent: Monday, July 17, 2006 11:52 PM
To: Ummalaneni, Venu Babu (Venu); ibis-users@eda-stds.org
Subject: RE: [IBIS-Users] Test case to see the sensitivity of split
C_comp values


Hi Venu,

Basically you need a non-ideal power delivery model in order to see the
effects of split c_comp.  

I recommend that you use a fully coupled (and frequency dependent would
be even better) sig/pwr/gnd package+PCB model that has ports at the
driver, receiver, and power supply locations.

There has been a lot of exploration work regarding how to split c_comp
over the past 1.5 years.  Zhiping Yang has published a few documents
about his techniques - it's a good place to start if you haven't seen
them yet.  
I believe this was his latest paper:
http://www.vhdl.org/pub/ibis/summits/dec05/yang.pdf

Just let me know if you have any other questions.

Thanks,
Sam


-----Original Message-----
From: owner-ibis-users@server.eda-stds.org
[mailto:owner-ibis-users@server.eda-stds.org] On Behalf Of Ummalaneni,
Venu Babu (Venu)
Sent: Monday, July 17, 2006 4:23 AM
To: ibis-users@server.eda-stds.org
Subject: [IBIS-Users] Test case to see the sensitivity of split C_comp
values

Hi Gurus,

Could some one suggest me a test case which can be useful for observing
the sensitivity of split C_comp values of IBIS?

Need for the test case: I am extracting the split C_comp values of the
IO buffer from two different approaches. I need to select one of the
approach by correlating with hspice model. For that, I need a test case
that is very sensitive to split C_comp values. 

Thanks in advance.

Best Regards,
Venu


sensitivity

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