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EDGE EMISSIONS of iCoupler

Question asked by Kou on Oct 29, 2013
Latest reply on Nov 1, 2013 by Kou

Dear Sir/Madam,

 

We have some questions about AN-0971/AN-1109 APPLICATION NOTE.

Pls refer to the documents.
http://www.analog.com/static/imported-files/application_notes/AN-0971.pdf
http://www.analog.com/static/imported-files/application_notes/AN-1109.pdf

 

There is the following description at Page3.
(1)AN-0971  When the edges mismatch by <20h, where h is the plane to plane pacing, the fields couple out of the PCB very efficiently,

                   resulting  in very high emissions.
(2)AN-1109  When the edges mismatch by 20h where h is the plane-to-plane pacing, the fields efficiently couple out of the PCB,

                   resulting in high emissions

 

Our questions:
Q1.AN-0971 -> <20h, AN-1109 -> 20h.
    Which is correct description?.

 

Q2:There are two limiting conditions,Fig2 and Fig3.
   Does this section explain which is better between edges are line up or one edges is pulled back?.

   If so,which recommendation do you have?.

 

Pls give the advice to us.
Thank you.

 

Sincerely yours,
Kou

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