[SI-LIST] Re: Altera PDN Tool
- From: Leonard Dieguez <ldieguez@xxxxxxxxxx>
- To: Joel Brown <joel@xxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 21 Jul 2009 10:34:18 -0700
Joel,
I'm not 100 % sure what manufacturer was used when those values where input to
the tool but probably AVX or Murata. The values do not represent the mounting
inductance since the tool calculates that depending on the mounting style and
dimensions that are input to the tool. You can also change your library or use
"user values" for ESL /ESR. As with any other EDA tool Garbage in equals
garbage out. So check the values for the caps that you are actually using and
also check things like the stack up heights Via placement and diameters and
trace widths.
Leonard Dieguez
High Speed IO Applications,
Altera Corporation
9330 Scranton Road, Suite 400
San Diego, CA 92121
ldieguez@xxxxxxxxxx
858.202.3511 (office)
"There are two kinds of engineers - those who have signal integrity problems,
and those who will." - Eric Bogatin.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Joel Brown
Sent: Monday, July 20, 2009 5:17 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Altera PDN Tool
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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