[SI-LIST] Re: Resistance
- From: "Greim, Michael" <mgreim@xxxxxxxxxxxx>
- To: "'Aubrey_Sparkman@xxxxxxxx'" <Aubrey_Sparkman@xxxxxxxx>,xlzhou@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 13 Aug 2001 16:18:40 -0400
Hi Aubrey,
Bulk resistivity of pure copper is 1.7e -8
conductivity is the inverse of that or 5.8 e 7
http://www.webelements.com/webelements/elements/text/Cu/phys.html
as was discussed previously, the introduction of
impurities into the copper will affect its conductance
and conversly resistivity.....
Advance apologies to those who feel I need additional
decimal points of resolution on my numbers. 8-)
Who said those chemistry classes and studying of
the periodic table wouldn't pay off.
best regards,
Michael Greim
-----Original Message-----
From: Aubrey_Sparkman@xxxxxxxx [mailto:Aubrey_Sparkman@xxxxxxxx]
Sent: Monday, August 13, 2001 3:35 PM
To: xlzhou@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Resistance
Hi Mick!
Aside from the differences (plated vs anealed, pure vs alloyed and layered)
others have pointed out, is it possible you had a sign error in your
calculations? resistivities for copper are in the mid e+7s not e-7s as you
have below.
Aubrey Sparkman
Signal Integrity
Aubrey_Sparkman@xxxxxxxx
(512) 723-3592
> -----Original Message-----
> From: Zhou, Xingling (Xingling) [mailto:xlzhou@xxxxxxxxx]
> Sent: Monday, August 13, 2001 9:07 AM
> To: Si-List (E-mail)
> Subject: [SI-LIST] Resistance
>
>
>
> Hi,
>
> When you calculate the DC resistance of wires and traces,
> which resistivity
> values should be used or more practical ? Most books give
> 1/5.8e-7 = 1.724e-8 for pure cooper. However, Dr. Johnson's book gives
> 6.787e-7 (p.411) and he explained his reasons. On p.409, he
> mentioned that "
> the authors have used MathCad to evaluate each of the
> following formulas in
> well-known test cases...". Obviously, the
> two values are quit different, three times ! So, please provide your
> suggestion ?
>
> Thanks.
>
> Mick
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