[SI-LIST] Re: Routing Parallel vs. Paralell
- From: "Beal, Weston" <weston.beal@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 14 Sep 2006 11:20:14 -0700
Celine,
Where is the ground plane in your physical model? This makes a
significant difference.
Weston
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Xilei Liu
Sent: Thursday, September 14, 2006 9:54 AM
To: weirsi@xxxxxxxxxx; pcbjack@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Routing Parallel vs. Paralell
Jack,
Wondering whether I should give your MATH question my PHYSICAL answer or
not.
Firstly, I assume that the coupling you mentioned refers to the coupling
between these two traces of different configurations.
Secondly, assuming that you have 1.6mm FR4(er=3D4.31), double sided, =
size=20
30*30mm^2; by APLAC simulation, the coupling factor(Ze-Zo)/(Ze+Zo) for
6mil=20
traces (1/2oz) routed 6mil broadside is about 0.65; and the coupling
factor=20
for 6mil traces routed 6mil(edge to edge) side by side is about 0.60;
1oz=20
copper doesn't change the results with 1/2oz copper.
So, it sounds that the statement"traces routed 1 inch in parallel will=20
couple the same amount as traces routed .2 inches broadside (layer to=20
layer)" is incredible, unless there is air or other material between
"layer=20
to layer"?
Well, should leave this MATH question to experts. Please give me $3
whenever=20
possible ;)
Regards,
Celine
>From: steve weir <weirsi@xxxxxxxxxx>
>Reply-To: weirsi@xxxxxxxxxx
>To: pcbjack@xxxxxxxxx,si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: Routing Parallel vs. Paralell
>Date: Thu, 14 Sep 2006 07:34:38 -0700
>
>Jack that is what we have field solvers for. You used to be able to
>rent time on Polar 8000 for about $20/hr. Otherwise find someone
>with Polar or Ansoft and run the model.
>
>Steve.
>At 07:29 AM 9/14/2006, Jack Olson wrote:
> >I got a MATH question I don't know how to solve...
> >I want to know the difference between running traces
> >parallel on the same layer (side by side) compared
> >to running them on different layers right on top of
> >each other (broadside).
> >
> >I know won't be a simple answer,
> >so I will provide a simple example:
> >
> >Say I am using 6mil traces with 6mil clearances on
> >layers that are 6mil apart using half ounce copper
> >(which is nearly .6mils) and both layers are internal.
> >
> >What distance can I route side by side and get the
> >same coupling as if I had routed them broadside?
> >
> >So I want a simple thing to remember that says
> >something like, "traces routed 1 inch in parallel will
> >couple the same amount as traces routed .2 inches
> >broadside (layer to layer)
> >
> >Does anyone know how to make my rule-of-thumb?
> >and if I change to 1oz copper, will the rule double?
> >
> >onward thru the fog,
> >Jack
> >
> >
> >------------------------------------------------------------------
> >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
> >
>
>------------------------------------------------------------------
>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
>
>
------------------------------------------------------------------
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: =20
//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
------------------------------------------------------------------
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:
