[PCB_FORUM] Re: Planes be POSITIVE or NEGATIVE
- From: "Moore, Blake" <Blake.Moore@xxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Fri, 25 Jul 2008 11:29:51 -0400
In general we always....
1. Top/Bottom outer layers are pos
2. Internal Signal layers are pos
3. Internal layers for power planes are neg
4. Internal layers for gnd fill, power return are neg
As for dynamic vs. static fill shapes, it's just your call, what you are
comfortable working with.
As you use both, you will learn when it's best for which one to use, it
just depends on your skill level.
Hope that helps
Blake Moore
ADI
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Dave Schaefer
Sent: Friday, July 25, 2008 11:10 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Planes be POSITIVE or NEGATIVE
Search the forum archives - there's many many many posts on the benefits
of each.
>
> From: "Jean Bratton" <jean.bratton@xxxxxxxxxxxxxx>
> Date: 2008/07/25 Fri AM 10:03:19 CDT
> To: <icu-pcb-forum@xxxxxxxxxxxxx>
> Subject: [PCB_FORUM] Re: Planes be POSITIVE or NEGATIVE
>
> I'm surprised to not see any feedback on this at all! My take is this
>
> External layers or any layer that's mixed wiring/plane you need to use
> positive shapes. Dynamic is best as you don't have to update each time
> you change something in that area.
>
> Inner layers that are fully plane (may be multiple planes, just no
> traces) are best done with negative planes. Allegro database and
output
> data files are smaller.
>
>
>
> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Zafar Bhatti
> Sent: Thursday, July 24, 2008 6:19 PM
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] Planes be POSITIVE or NEGATIVE
>
>
>
> Hi All,
>
>
>
> What is the preferred way to make planes, positive or negative,
dynamic
> or static. Any thoughts, insights would be deeply appreciated.
>
> Any pros / cons for both cases?
>
>
>
> Regards,
>
>
>
> Zafar Bhatti
>
> Design Engineer
>
> Whizz Systems Inc.
>
> Office:(408) 980-0400 Ext. 112
>
> Cell:(408) 569-0517
>
> zbhatti@xxxxxxxxxxxxxxxx <mailto:zbhatti@xxxxxxxxxxxxxxxx>
>
>
>
>
>
Dave Schaefer
dave.schaefer@xxxxxxx
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