[SI-LIST] Re: Altera PDN Tool

Joel:
This is good that you made light of this concern. A
simulator/calculator/spreadsheet is only as good as the understanding of its
limitations, where it is not valid. A good thing for Altera, would be to
include notes to such effect that you do not assume anything. In your case,
you validated what you believe to be inconsistent, which makes it no longer
an assumption. I do actually use their tool. It's simple but fairly
powerful, certainly quite useful.

Very good Joel.

Altera???

On Mon, Jul 20, 2009 at 5:17 PM, Joel Brown <joel@xxxxxxxxxx> wrote:

> I have been playing around with the Altera PDN tool.
> When I look at the ESR and ESL values on the Library page it seems the
> values match very closely with AVX SpiCap3 which makes me think that is
> were
> the values came from.
>
> When I used Kemet's spice program I get values that are quite different.
> One
> which stood out was an ESL of 1.9nh for a .01uF 0402 capacitor.
>
> So it makes me wonder if I use the values in the Altera library if the
> results are going to be anywhere close to reality especially if we are
> buying capacitors from Kemet or another vendor.
>
> I am assuming the ESL values in the Altera library don't include the
> mounting inductance since they model that separately.
>
> Is there any information comparing ESL from different capacitor vendors for
> 0402 or any other size capacitors?
>
>
>
> Thanks - Joel
>
>
>
>
>
>
>
>
>
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