[SI-LIST] Re: Disadvantages of wider traces

Hello Cheng,
At higher frequencies we model transmission lines as Lossy Lines, along with
defuault transmission line modeling, we consider Skin Effect as series
component and Dielectric loss in parallel, which is dependent on the
capacitance per length and which is highly influencied by loss tangent of
the material, as we increase the trace with capacitance per length increases
which causes Dielectric loss to increase.

Dielectric loss causes high frequency components attenuation which casues
rise and fall time degradation, which leads to Inter Symbol Interference.

Regards,
Simon


On 20/04/07, Zhenggang Cheng <zcheng@xxxxxxxxxx> wrote:
>
> Hi Simon,
>
> What do you mean that wider trace will reduce skin-effect? And how is
> that related to dielectric loss? To me, if skin-effect is reduced, it
> means R is deceased, and then copper loss is decreased.
>
> Look forward to your reply.
>
> Thanks,
>
> Zhenggang
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Partha Simon
> Sent: Thursday, April 19, 2007 6:02 AM
> To: babid_a@xxxxxxxxx
> Cc: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Disadvantages of wider traces
>
> Hello,
> Wider traces will lower the Z0 and may cause anti -reflection and it
> depends
> on what stack you are using, for typical 6-layer and nomial freqenciese
> they
> work well, and at higher higer frequencies they reduce skin-effect and
> may
> cause more dielectric loss.
>
> To work between these tradeoffs we need simulator and we cant generalise
> the
> case.
>
> Regards,
> Simon
>
>
> On 19/04/07, Babid A <babid_a@xxxxxxxxx> wrote:
> >
> > Hello,
> > Assuming that there is a chance for routing traces as wide as
> possible,
> > what are the disadvantages of having wider traces on the boards
> (>12mil) in
> > respect to noise, jitter etc?
> >
> > -Thanks,
> >
> >
> >
> >
> >
> > ---------------------------------
> > Ahhh...imagining that irresistible "new car" smell?
> > Check outnew cars at Yahoo! Autos.
> >
> > ------------------------------------------------------------------
> > 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:
> > http://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:
> >                http://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:
> http://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:
>                http://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
>
>
>
> -----------------------------------------------------------------------------------
> This email message is for the sole use of the intended recipient(s) and
> may contain
> confidential information.  Any unauthorized review, use, disclosure or
> distribution
> is prohibited.  If you are not the intended recipient, please contact the
> sender by
> reply email and destroy all copies of the original message.
>
> -----------------------------------------------------------------------------------
>


------------------------------------------------------------------
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:
http://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:     
                http://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: