Weak models are > Slow process, high temp and low voltage
typical models are > typical process, nominal temp & voltage
Strong models are > Fast process, low temp and high voltage
I have no control over the accuracy of the HSPICE models, they come from the
foundry. I am just curious if any knowledgeable people out there have definite
ideas on which parameters are best for generating Tco values and IBIS models
that they have had good results with. I think I hear everybody agreeing that
40pf is not useful, so then my question is what is useful?
At 04:58 PM 7/20/99 -0500, you wrote:
>Mark Nass wrote:
>> There has been some discussion recently about parameters of parts
>> specified into 40pf caps and accuracy of models. I generate this type
>> of data for our devices for our own use and our customers. So I am
>> curious as to what people think would be the optimal way to generate
>> Tco, Tsu, jitter parameters and IBIS models so that they would be confident
>> they were getting exactly what they needed for signal integrity and timing
>> analysis. Any feedback?
>> Mark Nass
>Can your provide the SI community some insight on how you generate these
>parameters now. Specifically, do you take measurements on a number
>of different samples over temp/voltage ranges and with different loads?
>Are they SPICE derived? Do you specify a certain amount of 'cushion'
>in the parameters? This might be helpful to those of us who don't know
>how vendors derive the numbers.
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