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How to draw a predefined NMOS in an double well

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dog1357

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the predefined NMOS is given in the model and surrounded by guard ring connected to substrate, is it possible to put it in an double well? by drawing a P well in to a N well, then put the NMOS layout in?

i am afraid that in the simulation, the NMOS is using the model linking to the predefined layout, if I change the layout, will it affect the circuit performance?

people say it support double well process, but i am still wondering how to fix them.

thank you.
 

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