[SI-LIST] Re: Altera PDN Tool
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Joel Brown <joel@xxxxxxxxxx>
- Date: Mon, 20 Jul 2009 17:41:48 -0700
Joel, Altera's PDN team is quite conscientious. While I have not run
the conventional caps through their paces on that tool, the X2Y results
are trustworthy.
An ESL of 1.9nH for an 0402 capacitor would reflect a high mounting
inductance and would not be anything like what you would see in a
shorted plate measurement, which is the basis for most datasheet ESL
values. You'll get 1.9nH or there abouts with a well mounted 0402 if
the vias have to extend about 70mils from the cap mounting surface to
the power cavity.
Best Regards,
Steve.
Joel Brown 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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