[SI-LIST] Re: PCB stackup

To minimize your radiation you may want to=20

1) ensure you have a low impedance power plane

2) be careful about shielding any cable grounds to your faraday case=20
"gnd".

To get a low impedance power plane you may want to consider having full
planes power planes, and a good decoupling strategy.

Also separation of ground plane to power plane plays a major role in
reducing power plane impedance.  Use the minimum prepreg size that can
be supported for volume production.

As for cables that is a whole different story and I don't think it is
relevant to your situation.

Nima Lotfi


> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
> Sent: Monday, February 21, 2005 3:03 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] PCB stackup
>=20
>=20
> Hi all,
>=20
> I am working on a product which requires high shielding (no
> interference with mobile pagers) and the PCB goes in plastic
> enclosure (w/o metallic paint).  The highest working frequency is
> 200Mhz and the PCB stackup is :
>=20
> TOP    ground
> Layer1 signal + power fill 1.8V
> Layer2 ground
> Layer3 signal + power fill 3.3V
> Layer 4 signal + power fill 5V
> Layer 5 ground
> Layer 6 signal + power fill 3.3V
> Bottom ground
>=20
>=20
> Is this stackup ok? and do you think that not having a full power
> plane would be a problem?
>=20
>=20
> thanks
>=20
>=20
>=20
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>=20
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
>=20
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>=20
> List FAQ wiki page is located at:
>                 http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>=20
> List technical documents are available at:
>                 http://www.si-list.org
>=20
> List archives are viewable at:
>               http://www.freelists.org/archives/si-list
> or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>=20
>=20

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: