RE: [IBIS-Users] Ground Clamp Reference

Mei,

The IBIS specification doesn't spell out what to do to
determine the sweep ranges of the min and max corners.

It is OK to use the typical supply value for the sweep
range in all corner cases.  However, if you want to
go out of your way, you can use the maximum value for
all corners in determining the sweep range.  It is up
to you.  You just have to make sure that you don't
have any "NA" in the first and last position of the
data tables.

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

-----Original Message-----
From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of NG,MEI-YEE
Sent: Tuesday, October 17, 2006 10:59 PM
To: Lynne D. Green; ibis-users@server.eda.org; ibis-users@server.eda.org; Ambrish Varma; Mirmak, Michael
Subject: RE: [IBIS-Users] Ground Clamp Reference

Hi Lynne,

I understand that the range -Vcc to Vcc is the IBIS standard for Ground
Clamp curve, however, does the range change according to the min and max
simulation? For example, in min, my Vcc will be lower hence, the range
-Vcc to Vcc will be different from the range for typical simulation, is
that right? Same case for max, my Vcc will be higher, so does my
simulation range change according to the max Vcc as well?

Thanks.

Best regards,
Mei Yee

-----Original Message-----
From: Lynne D. Green [mailto:lgreen22@mindspring.com] 
Sent: Wednesday, October 18, 2006 1:51 PM
To: NG,MEI-YEE; ibis-users@eda.org; ibis-users@eda.org; 'Ambrish Varma';
'Mirmak, Michael'
Subject: RE: [IBIS-Users] Ground Clamp Reference

Hello, Mei Yee,
 
Yes, this is standard for all of the I-V tables.  It is highly
recommended
that all I-V tables should go from -Vcc to 2*Vcc in the completed IBIS
model.
 
More information can be found in the IBIS Cookbook.
http://www.vhdl.org/pub/ibis/cookbook/cookbook-v4.pdf
 
When you have completed a model, please feel free to send it to the IBIS
Model Review Committee.
http://www.eigroup.org/ibis/support.htm
 
Best regards,
Lynne
 
 
"IBIS training when you need it, where you need it."
 
Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@mindspring.com
 

 

________________________________

	From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]
On
Behalf Of NG,MEI-YEE
	Sent: Tuesday, October 17, 2006 8:44 PM
	To: ibis-users@eda.org; ibis-users@eda.org; Ambrish Varma;
Mirmak,
Michael
	Subject: [IBIS-Users] Ground Clamp Reference
	
	

	Hi all,

	 

	I used s2ibis3 to simulate my Input pad and I realized that the
sweep range for Ground Clamp curves are from -Vcc to Vcc, where Vcc is
the
the value for typical. However, this range remains the same figure for
ALL
corners i.e. fast, slow and typical. This means that if my Vcc is 3V,
the
sweep range for all the corners is -3 to 3V, regardless of my Vcc at
various
corners.

	 

	Is this the standard for Ground clamp? I tried using the keyword
[GND clamp reference] 2.7 3 3.3 but the range still remains -3 to 3V.

	 

	Kindly advice.

	 

	Thank you.

	 

	Best regards, 

	Mei Yee




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