[IBIS-Users] Modeling Diff Buffers

Hi Experts,
Could you please answer my below questions?

1. If vdiff value varies for diff pins (due to diff modes of operation, 
namely speed), How do I define that in IBIS models.
Through [Diff Pin] keyword, we can pass only one value to vdiff.

2. How to define common mode value in the diff signals? (I believe there 
are other IBIS users who raised the same question some time earlier)

3. When measuring C-Comp for drivers,
I see three main variables on which die cap depends on.
1. Freq of operation
2. Data value (0 to vdd) to be sent
3. Process corners

I vary these three variables and finding the max and min value for 
C_comp. Is that right?
But,  I usually see very huge die-cap for the drivers(unrealistic)






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