[SI-LIST] Re: [!! SPAM] Re: 6 layers stackup

Can't resist to illustrate this with an example:

If you want to compare the weight of an ant and a cricket and you put
them on top of the same bulldozer, you will not see much difference in
their weight...

Arpad
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Lee Ritchey
Sent: Tuesday, February 26, 2008 11:16 AM
To: Charles Grasso; Scott McMorrow
Cc: Steve Weir; QU Perry; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: [!! SPAM] Re: 6 layers stackup

What does the test vehicle have to do with it?  Both capacitors are
seeing
the same stackup.  It's apples and apples.   Why 26 layers?  Lots of
PCBs
have 26 layers, pretty much all of them in terabit routers.  This PCB
was
used to test may things besides these two capacitors.

What is being presented is the difference between the two capacitors
under
the same set of test conditions and it is not much.

There are two sets of tests.  One with the capacitors connected to the
first two planes inside the PCB, which is the lowest added inductance
and
the other is with the capacitors attached to two planes further down in
the
PCB.
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