[SI-LIST] Re: surface finish
- From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
- To: "rdawson16@xxxxxxxxxxx" <rdawson16@xxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 11 Oct 2013 14:30:18 +0000
I believe this (roughness) is a separate topic than surface finish. Surface
finish is the addition of layers above the microstrip copper, it doesn't apply
to stripline. Surface roughness is the roughness of the copper, it is an issue
for both stripline and microstrip. Typically however, we consider the
roughness of the top half of microstrip a moot point; I haven't seen any
studies emphasizing that.
Also, it's not a valid picture of the physics to represent the trace getting
longer due to roughness.
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Randy Dawson
Sent: Thursday, October 10, 2013 6:31 PM
To: weirsi@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: surface finish
One of the main reasons this comes up is in high frequency design, surface
roughness can have a dramatic effect on RF performance due to skin effect.
Some of the better 3D field solvers the surface roughness can be specified, and
taken into account for calculated impedance and propagation delay (the trace
gets 'longer' due to EM propagating closer to the surface).
Randy
> Date: Thu, 10 Oct 2013 17:00:14 -0700
> From: weirsi@xxxxxxxxxx
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: surface finish
>
> Welcome to the world of: "It depends."
>
> What is the product working environment? In particular: humidity,
> temperature, and salts.
> What are the product reliability requirements?
> What is the product's longevity requirements?
>
> Steve.
> On 10/10/2013 4:51 PM, Randy Norman wrote:
> > Greetings
> > I see a lot of discussions on surface finish. Losses and all can be a
> > problem.
> > Why is it necessary for traces?
> > Some say you do not need it for traces because you have soldermask.
> > Sure for the pads but what about everything else?
> > Thanks
> > Randy
> >
> > ------------------------------------------------------------------
> > 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 forum is accessible at:
> > http://tech.groups.yahoo.com/group/si-list
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
>
>
> --
> Steve Weir
> IPBLOX, LLC
> 1580 Grand Point Way
> MS 34689
> Reno, NV 89523-9998
> www.ipblox.com
>
> (775) 299-4236 Business
> (866) 675-4630 Toll-free
> (707) 780-1951 Fax
>
> All contents Copyright (c)2013 IPBLOX, LLC. All Rights Reserved.
> This e-mail may contain confidential material.
> If you are not the intended recipient, please destroy all records and
> notify the sender.
>
> ------------------------------------------------------------------
> 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 forum is accessible at:
> http://tech.groups.yahoo.com/group/si-list
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> 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 forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
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 forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
