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May 2004

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Subject:
impedance calculation
From:
Mark Larson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 3 May 2004 11:05:07 -0500
Content-Type:
text/plain
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text/plain (19 lines) 
Hi,

when doing an impedance calculation of a trace more accurate results come
from using the trapizoidal shape of the trace cross section rather than a
square one, is there a rule of thumb people use for what the top width of
the trace is in relation to the base? obviously this will be based on the
copper thickness. Since it is such a small variable, is there ever a
situation where it is really important?

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