[SI-LIST] Re: Designing PCB Stackups
- From: "DAVID CUTHBERT" <telegrapher9@xxxxxxxxx>
- To: "codymiller@xxxxxxxxxx" <codymiller@xxxxxxxxxx>
- Date: Thu, 11 Dec 2008 07:27:03 -0700
Hi Cody,
ask five engineers what stack-up to use and you'll get five different
answers. It seems to me that this is still treated as a black art with pure
empiricism thrown in. It doesn't have to be this way. By defining or
specifying the desired characteristics a suitable stack-up will almost
design itself. Characteristics such as Z0 tolerance will drive trace width
given the claimed variability of the PCB vendor's process. The required
power bus impedance will drive the power plane(s) spacing and location
within the board.
I use SPICE to model power planes and SONNET LITE to model traces.
Dave Cuthbert
On 12/10/08, codymiller@xxxxxxxxxx <codymiller@xxxxxxxxxx> wrote:
>
> All,
>
> I have a general question regarding PCB stackup design. I am evaluating
> how we design our pcb stackups in our group now and I would like to put
> a procedure together or a set of rules of thumb to properly design a
> stackup. I would like the procedure to ask all the right questions up
> front.
>
> One question that came up is do PCB designers typically design with
> vendor specific materials in mind or do they design with generic prepreg
> and core materials. I see some pros and cons to both. What is typical in
> the industry.
>
> Any advice would be appreciated as well as if you know of any
> papers/resources on the web that could be helpful.
>
> Thanks,
> Cody
> ------------------------------------------------------------------
> 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 technical documents are available at:
> http://www.si-list.net
>
> 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
>
>
>
------------------------------------------------------------------
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 technical documents are available at:
http://www.si-list.net
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:
