Werner,
    What you are referring to is called microstriping. The formulas that
apply are very intense. There are a few programs that you can down load
free, that will help. I don't have them handy, if I find one I will forward
the info to you. Remember that even the type of fiberglass used in the
circuit board will effect your calculations. The location of other
components around the coil will also have an effect. I assume that you meant
nH for the coils, you will not have any problems implementing the inductors
with the aid of a good program and a little knowledge of microstriping.
Good luck.

Gordon Varney

> Hi
>
> I'm designing an application that requires a few small coils with low
values
> 1uH to 150uH. I've seen a few designs where the coil is part of the layout
> on the PCB, and was wondering if anyone has any formulas for these coils.
Or
> is it a try your luck and see what value pops out thing?
>
> Thanks!
>
> Friendly Regards,
> Werner Soekoe
> WernerS@fsl.gov.za
>
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