[SI-LIST] Re: Board Layer Material Comparison
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Rick.Baze@xxxxxxxxxxx
- Date: Tue, 07 Sep 2004 11:43:07 -0400
Rick
the N4000-13 SI material will provide several benefits based on it's
lower Er and lower Er of the SI-glass.
1) Reduced overall pcb thickness
2) Reduced local Er variation due to laminate fiberglass weave.
3) Increased power/ground plane resonant frequency, which extends the
useful range of operation of thin power/ground laminates.
4) Wider, lower-loss, traces for a given dielectric thickness.
5) Thinner dielectrics for equivalent trace width.
The downside
1) SI material is more expensive by about 20%
2) SI material is more costly to process, due to higher drill wear.
3) No advantage in dielectric loss over N4000-13 material.
4) Limited material laminate weaves available.
Baze, Rick wrote:
>A 30-layer board we are in process of designing is under discussion of
>materials to use and their related advantages and disadvantages.
>
>The current design has the top 8 layers using N4000-13 for signal/gnd, the
>next 12 layers using GETEK for power/gnd, and the bottom 10 layers again using
>N4000-13 for signal/gnd.
>
>The proposed design is all N4000-13 SI.
>
>The debate is what advantages/disadvantages there are between the two designs
>besides the original design requiring longer, more expensive processing.
>
>Feedback is greatly appreciated.
>
>Best Regards,
>Rick
>------------------------------------------------------------------
>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:
>//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:
> //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
>
>
>
>
--
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
(503) 750-6481 Cellular
http://www.teraspeed.com
Teraspeed is the registered service mark of
Teraspeed Consulting Group LLC
------------------------------------------------------------------
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:
//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:
//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:
