Re: [SI-LIST] : Calculating Trace Inductance

Doug Brooks (doug@eskimo.com)
Tue, 24 Nov 1998 17:29:52 -0800

One approximation is

L approx. = 5*ln(2*Pi*h/w)
where L = nH/in
w, h in mils (trace width and height above plane, resp.)
Pi = 3.14159
ln = natural log

Thus 10 mil wide trace 10 mil above plane is approx
9.2 nH/in (according to this approx)

Hope this helps

Doug Brooks

At 02:06 PM 11/24/98 -0800, you wrote:
>
>What is the formula for calculating the
>inductance/inch of a microstrip Cu trace?
>
>Regards, Doug
>
>
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UltraCAD Design, Inc. http://www.ultracad.com

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