mixed circuit guardring

[mssong]

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.

 

[HoseinAli]

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

 

[sidun.av]

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?

 

[mssong]

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?

it means the following

 

[sidun.av]

it means the following
View attachment 198717

Okay, I think my previous message answers your question then.