[SI-LIST] Re: 4 Layer card with blind & buried via's
- From: <Wolfgang.Maichen@xxxxxxxxxxxx>
- To: <sunil_bharadwaz@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 3 Dec 2012 14:36:41 +0000
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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