[SI-LIST] Re: Trace Width
- From: <art_porter@xxxxxxxxxxx>
- To: <qazi@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 21 Nov 2005 13:44:30 -0700
Depends on what you're trying to achieve and how much you care about =
high frequencies. Two big advantages of fatter traces:
* Less increase in resistance due to skin effect at high frequencies
* Better control over impedance in the manufacturing process. Let's say =
your vendor/process can control trace widths to +/- 3 mils. 3/45 is a =
lot less change than 3/18.=20
* And of course lower overall resistive losses across the frequency =
spectrum =20
Not that I would classify myself as a guru by any means.=20
Art Porter
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Qazi Arif Iqbal
Sent: Monday, November 21, 2005 1:31 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Trace Width
Hi Gurus,
In an imaginary case where real estate is not an issue would the gurus
prefer a fat 45 mil trace over a 18 mil or less thick 50 ohm trace =
assuming
current carrying ability is not an issue.
For example for a microstrip co-planar waveguide case with Fr-6 as
dielectric and half oz Cu gives 50 ohms for,
Case 1:45 mil wide trace with 50mil speration from co-planar gnds and 21
mils from a gnd plane.
Case 2:10 mil wide trace with 18mil speration from co-planar gnds and 10
mils from a gnd plane.
Which one would the gurus pick?
Thanks in advance.
-Qazi
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=20
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