Subject: Re: [IBIS-Users] C-Comp
From: Robert Haller (rhaller@sisoft.com)
Date: Fri Jul 18 2003 - 10:10:03 PDT
IBIS users,
At today's IBIS open forum call, the issue was raised concerning the
limitations of Ccomp in the present IBIS spec. This issue is being added
to the next ibis open forum agenda technical discussion.
I would like to solicit feedback from Model developers and users for
proposed changes, as well as voice my own opinion.
Present syntax
| typ min max
|
C_comp 3.90pF 3.10pF 4.80pF
My personal experience has shown that I/O buffer often have different
C_comp when driving and receiving. To keep things simple, I would
suggest that a simple extension to the C_comp would be to specify a
C_comp driving and C_comp receiving for Model_type = I/O
regards,
bob
-- Robert J. Haller (rhaller@sisoft.com) Principal Consultant Signal Integrity Software Inc. 6 Clock Tower Place, Suite 250 Maynard, MA 01754 Phone: (978) 461-0449, ext 15Roy Leventhal wrote: > Anshuli, > > Be aware that capacitive behavior is included in the V-T behavioral curves > and/or the slew rates based on them. Unsophisticated providers of simulation > software (hopefully, few remain) can thus mistakenly "double count" the > effects of Ccomp unless they adjust for its presence in the circuit. > > So, why is Ccomp included? To account for the capacitive loading on the > circuit, direct or reflected wave, and it is the total capacitive loading > looking into the die pad. > > > Best Regards, > > Roy >
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