[SI-LIST] PCB STACKUP
- From: "Nosovitski, Alexander (Contr)" <alexander.nosovitski@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 21 Jan 2004 13:02:40 -0800
Hello si-list,
The design I am working on has a dense placement.
The proposed stack up looks as follow:
TOP
POWER_ANALOG
DIFF_SIGNAL (Gb/s signals)
AGND
GND
POWER
S
S
GND
POWER
S
S
GND
SPLIT_POWER
GND
S
S
POWER
GND
S
S
GND
AGND
DIFF_SIGNAL_ANALOG (Gb/s signals)
POWER ANALOG
BOTTOM
All signal layers are 0.5 Oz copper and
All planes are solid ( except one in the middle) with 0.5 Oz copper.
The diff. signals are running at 2.5Gb/s.
There are different opinions about analog plane location.
Could the arrangement above cause a problem?
What else should I be concern about?
Any help or suggestion is appreciated!
Regards,
Alexander Nosovitski
-----Original Message-----
From: Salkow, Steven [mailto:steven.salkow@xxxxxxxx]
Sent: Wednesday, January 21, 2004 1:57 PM
To: weirsp@xxxxxxxxxx; fred@xxxxxxxxxxxxx; kar_thik_v1@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Looking for thin dielectric tape
4 mil prepreg (pcb laminate) is generally available from anyone doing
multilayer PCB. You may also get samples from laminate vendors (dupont,
Norplex) (sprayed with Scotch 444 adhesive for cold adhesion to copper
foils)
3M (tape division) have exactly what your looking for up to 36" wide
slit to any width but they have minimum qtys
see
http://products3.3m.com/catalog/us/en001/utilities_telecom/oem_electrica
l/node_R5MTBSFVGPbe/root_GST1T4S9TCgv/vroot_GSHBRQT7DVge/gvel_BBGZX3B1QG
gl/theme_us_oemeletrical_3_0/command_AbcPageHandler/output_html
Catalog on the above page for download
Steve Salkow
Lockheed Martin
3200 Zanker Road
San Jose, CA 95134
(408) 473-4058 (san Jose)
(408) 742-4162 (Sunnyvale)
steven.salkow@xxxxxxxx
salkow@xxxxxxxxxxxx
(925) 462-1075 Home
(925-) 487-5946 Cell
(408) 468-7271 Numeric Pager
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of steve weir
Sent: Tuesday, January 20, 2004 11:17 PM
To: fred@xxxxxxxxxxxxx; kar_thik_v1@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Looking for thin dielectric tape
If you want to lay out a board, onesy, twosy, Express PCB is not a bad
way
to go. www.expresspcb.com It sure beats the Bishop Graphics adhesive
backed Cu tape, or a bathroom full of ferric chloride.
Steve.
At 01:44 PM 1/20/2004 -0800, Fred Townsend wrote:
>The last time I check you could still get mylar sheeting at most
>drafting and staionary stores. You would to apply your own adhesive.
>Comes in 4 and 7 mil thicknesses. You can also get polyester sheeting
>frosted one side and adhesive on the other for making labels. Failing
>that how about 3M's double sticky magic tape?
>
>Fred Townsend
>
>Karthik V wrote:
>
> >Hello,
> >
> > I am a student at the State University of New York. I am
> looking for a double sided sticky dielectric tape (more like a sheet )
of
> thickness about 4mils (0.1mm) and with a dielectric constant of
> around 4, to use between copper sheets - to make a "temporary board".
I
> tried things like epoxy, but it's almost impossible to get it so thin
and
> still provide infinite DC resistance.
> >
> > Could anyone point me to places where I could look for this
> kind of stuff. Is there anything else I could try to get the
dielectric
> (with Dk around 4) so thin ( apart from elaborate processes ) .
> >
> >thanks in advance,
> >Karthik,
> >
> >---------------------------------
> >Do you Yahoo!?
> >Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes
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