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Analog and digital part supply connections

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melkord

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In my process, the Bulk of NMOS is NOT connected to the Source.
It is not a problem so far in the analog part.

Now I use pcells for digital parts.
In these pcells, the Bulk of NMOS is connected to the Source.

I am aware this is process dependent.
How do you usually deal with this?
Is there any way to isolate the digital part?
 

As you indicate, there are many ways and vary with process/application. Trenches, wells, isolation distance, etc, etc, can be added to your design. Probably as many ways as there are designers.

To begin with though, is it a real problem that the substrate is connected to ground in your case?
 

In my process, the Bulk of NMOS is NOT connected to the Source.
It is not a problem so far in the analog part.

Now I use pcells for digital parts.
In these pcells, the Bulk of NMOS is connected to the Source.

I am aware this is process dependent.
How do you usually deal with this?
Is there any way to isolate the digital part?
The best way to isolate the digital part is by using Deep N-wells for your analog. This would create a local substrate for the analog, isolated by the digital noise.

Thanks,
Electronics_rama
 

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