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barrel effect in metal-metal capacitors

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Humungus

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capacitors

Hi,

Does anybody know what the barrel effect is in large metal-metal capacitors?

I have in hand a layout checklist and this is mentioned as being some kind of issue.

Do you have any information or description of it?

Thanks.
 

erikl

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Humungus said:
Does anybody know what the barrel effect is in large metal-metal capacitors?
I'm not quite sure, but I guess the optical barrel distortion effect is meant, which tends to reproduce large rectangular structures into barrel-like geometries - depending on the lithography equipment used. This could increase the intended capacitances a little bit, the effect increases non-linearily with increasing structure size. If this should be a pb., compose all caps from (integer) numbers of smaller caps of the same size - which is good practice anyway.
 

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