mixed signals circuit - layout advices needed

[electronXwork]

mixed signals circuit

Hi all,

I am laying out a mixed signals circuit like audio codec so i am asking the circuit and layout experts to advice me what are the considerations i must take.

thanks in advance....

 

[Sadegh.j]

Re: mixed signals circuit

I am not an expert in this field, but I was working with an expert a while ago who told me that Substrate noise in these circuits are usually problematic. It is very important to protect the analog circuit, may be a use a guard or something

 

[meitolake]

mixed signals circuit

Digital circuit can generate noise, these noise comprises a lot of harmonic. These noise interferes analog circuit on the same chip.
Place and route carefully to reduce this interference. Such as digital gnd, analog gnd.

 

[test_123]

mixed signals circuit

yes, guard ring is important