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How to do double guard ring without problem of diodenwx? (Read 2375 times)
Jacki
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How to do double guard ring without problem of diodenwx?
Jul 05th, 2014, 7:59am
 
Hi All,

   I am adding a double-guard-ring for NMOS in the layout (inner ring is P-ring, outer ring is N-ring), but in DRC check, it seems I have the problem of diodenwx. The error is "DIODENWX not over DIODE" must be connected in parallel to a similar diode in a device which is compared in LVS. Then I add the tie-down diode n-diffusion in substrate, but still the problem cannot be solved.
   First I want to understand why I get this DRC error, because I think I follow the normal double-ring rule to add the double ring for the NMOS transistors.
   Second, even I need to add a similar diode in parallel, I think the tie-down diode between n-diffusion and p-substrate should be the right one in the layout, why it doesn't work?
   Any comments are appreciated.
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