Capacitance of a 0402 package

Feb 11, 2014 2 Replies
J

Folks, while looking for ferrite beads I came across this:



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The bead on the last page bottom right shows Z at around 800ohms at



3GHz. That comes to less than 0.07pF. Just wondering, how do they do this in a 0402 package?

If anyone knows of beads quantified above 3GHz I'd appreciate a hint.


Regards, Joerg http://www.analogconsultants.com/
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P

Sounds about right--the capacitance wants to go as the linear dimension. It'll depend on the layout, of course--thin FR4 above the ground plane will help a lot.

Cheers

Phil Hobbs

Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
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J

Thanks, good to know that it's in the ballpark. I almost could not believe it.

Regards, Joerg http://www.analogconsultants.com/
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