GUARD RING and POLY in between

[sathi.ec]

Hi
can any one explain me what is the advantage of using this type of guard ring.

Please look at the attachment.

Thanks,
Sathisha

 

[leo_o2]

It is used to isolate gate to prevent poly coupling?

 

[Colbhaidh]

This could be a poly field ring used to shape the depletion region beneath the field. It is used in high voltage layouts and the poly can be floating. The easiest way to tell of it is a field ring is there should be a floating implant region beneath it (beneath the field oxide).

 

[sathi.ec]

this guard will be used for the entire cut or any blocks.