How guard ring reduces parasitic resistances

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jagadeesh2k1

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Can any one of u help me in this case of how latchup be prevented by a guard ring..........................thanks in advance
 

Guard ring connect the well or substrate to the power line directly. so the resistance is reduced.
 

Hi jagadeesh2k1

Guardring is a vent for reverse leakage current in a circuit to the corresponding power rail. In case of pfets, if there are any parasitic Tx formedin the layout, in order to reverse bias these parasitic Tx, the Nwell tap is connected to VDD which acts as a path for this reverse leakage current. Hence latchup is prevented .
The same holds good for nfets wherein the substrate tap is connected to GND. I believe that helps.


Regards
Brittoo
 



Sorry can you elaborate more? I want it in much greater detail.
 

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