Different isolation techniques used to isolate devices with different potential?

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MubarakKhan

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what are the different isolation techniques used to isolate devices with different potential?
like I Know about deep N-well, P-well is used to isolate the devices with different potential.
are they any other techniques in use? for example, 4-NMOS transistors connected in series with their body and source tied together, the last transistor connected to GND and First one to VDD to isolate this 4-device can we use junction isolation?
 

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