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how to fix Vt of a FET?

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electronics_kumar

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WHAT /HOW the value of parameter Vt is fixed during its fabrication....
i dont know whether it should be higher or lower.....help me in this regard
 

wwfeda

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Vt is usually changed by the doping level of the region under your gate oxide. If you want a lower Vt, you dope it lighter. If you want a higher Vt, you dope it denser.

Vt can also be change if you connect your bulk/body to a voltage other than ground.
 

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