[SI-LIST] Re: Disadvantages of wider traces
- From: "Leonard Dieguez" <ldieguez@xxxxxxxxxx>
- To: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>, <istvan.novak@xxxxxxx>
- Date: Fri, 20 Apr 2007 08:58:20 -0700
Jeff
I stand corrected. What I mean is that the dielectric losses will
dominate over copper losses at the higher frequencies on wider traces.
Jeff please refer to Istvans comment. This to me means there is a point
of diminishing returns on going wider. If I can I will normally pick a
trace width where the copper loss is about equal to the dielectric loss.
Leonard.=20
-----Original Message-----
From: Loyer, Jeff [mailto:jeff.loyer@xxxxxxxxx]=20
Sent: Friday, April 20, 2007 7:23 AM
To: Leonard Dieguez
Cc: si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: Disadvantages of wider traces
Can you point me to some data that shows wider traces have higher
dielectric loss? My experiments to date don't show that. =20
http://pcdandm.com/cms/content/view/2572/95/
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Leonard Dieguez
Sent: Thursday, April 19, 2007 3:46 PM
To: babid_a@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Disadvantages of wider traces
It depends on the operational bit rates of the signals on that trace.
Wider traces do give lower skin losses, but dielectric losses will
increase and will eventually dominate at a given frequency for a given
material and trace width. Therefore at a bit rate (Gbps) adding trace
width will actually increase losses. =3D20
I also agree with Istvan with his comments on routing density and
crosstalk. With today's high pin count devices that aspect cannot be
ignored.=3D20
Leonard Dieguez
Cat herder
Video: Crazy cat women!
http://www.youtube.com/watch?v=3D3DafpTHe91KFc
=3D20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Babid A
Sent: Wednesday, April 18, 2007 8:28 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Disadvantages of wider traces
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,
=3D20
---------------------------------
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=3D20
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