[SI-LIST] Re: Decoupling capacitors

>
>
>For  example, say you are interested in effects up to 1 GHz on an
>FR-4 board. The equivalent wavelength then would be (3e8/1000MHz)/sqrt(4)
>or 150 cm.  1/10 of 150cm is 15 cm, so on a board whose size is say
>300cm x 300cm you would ideally want a mesh of about 20x20 for maximum
>accuracy. (if I haven't messed up the math :)
>
>  
>
Ray,  that should be 150 mm, not 150 cm.  The 1/10 wavelength mesh would 
be 15 mm per square, or 590 mils per square.  So for a 300 mm x 300 mm 
(about 12 in x 12 in) board the ideal mesh for 1 GHz bandwidth would be 
20 x 20.

The result is still the same. ( A 300cm x 300cm board would be pretty 
darn big!)


best regards,

scott

-- 
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com




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