Lee,
Yes, stacked vias are expensive, but L1-L3 skip vias dont need to be
stacked unless the via depth is too much...
Regards
Istvan Novak
Oracle
On 6/9/2017 11:23 PM, leeritchey wrote:
That would be a stacked via which is very expensive! I would avoid
doing this.
Sent via the Samsung Galaxy S® 6, an AT&T 4G LTE smartphone
-------- Original message --------
From: Istvan Novak <istvan.novak@xxxxxxxxxxx>
Date: 06/09/2017 5:23 PM (GMT-08:00)
To: asparky@xxxxxxxxxxxxxxxxxxxxxxxx, silistguy@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Blind Vias & Plating Question
Aubrey,
Why would a L1-L3 or L4-L6 via on a 6-layer board be buried via?
Regards,
Istvan Novak
Oracle
On 6/9/2017 7:51 PM, Aubrey Sparkman wrote:
Si Guy,an impedance target to your supplier? Most I've dealt with are happy
technically, you have buried vias, not blind. Did you not specify
to adjust your trace widths to hit your impedances; it's easy for them
make the adjustments unless your design widths are already at the
limits of their processing capability.
barrel wall. This means you will also have similar amounts on the
A common desire is to have a mil or more of copper for the via
layer for each end of the via.
kick my
Aubrey
Sent from my iPhone
On Jun 9, 2017, at 4:08 PM, SI Guy <silistguy@xxxxxxxxx> wrote:
calculations/sims, not equations*
On Fri, Jun 9, 2017 at 3:58 PM, SI Guy <silistguy@xxxxxxxxx> wrote:
Hi Experts,
I did my first design with blind vias. It's already starting to
contactingass AFTER I've already designed it. I realize the importance of
4-6 on aboard shop before design, too bad boss doesn't allow the engineer to
control that.
My question is then, experts, if blind vias are used say 1-3 and
have some6 layer foil lamination board, do those inner layers also have to have
plating in addition to the bare copper thickness? Always?
I used 1/2 oz cu on all layers and expected only outer layers to
4 willextra thickness from plating. Now a shop is saying no no no, 3 and
jackedbe plated too. Now my inner layer transmission line equations are
approachup! Not to mention the outer layers too.
Sad day. =(
Any experience would help. What in the world is the right way to
kicks yourthese situations. Books and seminars say one thing but then life
------------------------------------------------------------------butt. So frustrating!!!
Thank you, experts.
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