basiclly, you can provide Pmos with different Nwell for bulk voltage, how about Nmos? With Deep newll you can do it too.
secondly, Deep Nwell can used as guardring
You are right!
I mean it is another "N well implant".
Added after 3 minutes:
waxtomato said:
basiclly, you can provide Pmos with different Nwell for bulk voltage, how about Nmos? With Deep newll you can do it too.
secondly, Deep Nwell can used as guardring
Deep n-well is for the isolation. Guard rings can protect the horizantal currents but can not protect the vertical currents(which can travel deep in to the substrate and can couplr to the nearby sensitive circuits). So deep N-well can prevent vertical currents generated by the high power devices.Correct me if i'm wrong.