Describe Twin-tube process with diagram.
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Twin Tub Process: 

A logical extension of the p-well and n-well approaches is the twin-tub fabrication process. 

In this process, a substrate of high resistivity of n-type material is used and then in this n-type material both n-well and p-well regions are created. 

By using this process, it is possible to preserve the performance of n-transistors without compromising the p-transistors. 

The doping control is more rapidly achieved and some relaxation is manufacturing tolerances results. 

This is particularly important as far as latch up is concerned.

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