[SI-LIST] Re: 4 Layer card with blind & buried via's
- From: "Bill Hargin \(ICD\)" <b.hargin@xxxxxxxxxx>
- To: <Wolfgang.Maichen@xxxxxxxxxxxx>, <sunil_bharadwaz@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 3 Dec 2012 09:31:27 -0800
Hi Sunil:
<Can i also use a blind via directly from Layer -1 to Layer-3 or do i have
to use a blind Via from Layer-1 to Layer -2 & then have a buried Via from
Layer-2 to Layer-3 ?>
You can use a blind via from L1-L3 ... Wolfgang is correct, though I'll add
this: buried vias would perhaps cost enough more to fabricate than going
with a 6-Layer design -- not to mention other issues that may come up if you
try to sqeeze too much into the two resulting signal layers.
We have a tool that helps with stackup tradeoffs ... There's an eval version
on http://www.icd.com.au/FX.html .
Bill Hargin
In-Circuit Design, USA
Software & SI Simulation for High-Speed PCB Design
(425) 301-4425 b.hargin@xxxxxxxxxx Skype: bill.hargin
Online: www.icd.com.au
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Wolfgang.Maichen@xxxxxxxxxxxx
Sent: Monday, December 03, 2012 6:37 AM
To: sunil_bharadwaz@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 4 Layer card with blind & buried via's
My guess is that adding blind vias to the design will cost way more than
going from 4 to 6 layers...
Regards, Wolfgang
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of sunil bharadwaz
Sent: Monday, December 03, 2012 3:22 PM
To: SI LIST
Subject: [SI-LIST] 4 Layer card with blind & buried via's
Hi All ,
I'am trying to do a board for a micro BGA with 0.4 mm pitch & 0.25 mm ball
dia.
To cut down the cost , i want to use a 4-layer card instead of a 6-Layer
card.
Layer -1 to Layer -2 & Layer -4 to Layer-3 would be blind Via's .
Can i also use a blind via directly from Layer -1 to Layer-3 or do i have to
use a blind Via from Layer-1 to Layer -2 & then have a buried Via from
Layer-2 to Layer-3 ?
Layer 1 & 4 - Signal.
Layer-2 - complete gnd plane.
Layer -3 Vcc & gnd plane.
I'am looking forward to hear the rules followed in designing such boards.
Thanks for all the help in advance !!
Regards
Sunil.B
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