mixed circuit guardring

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mssong

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When guard ring a layout, if there are digital and analog circuits together, do I always have to guard them separately?

Or can I put the digital and analog circuits together and put the entire guard ring outside?

In the latter case, I would put a double guard ring around it.
 

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its up to youe desire, if you have no worry about noise and interferences do what is easier
 

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You don't have to guard them separately, but it is strongly recommended.
When you combine analog and digital devices, you reduce the noise immunity of the circuit through the substrate/well. What is the purpose of the double guard ring and what do you mean by saying that?
 

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it means the following
 

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