Problem $3(20\%)$

What is the threshold voltage, VT$,$ of the MOS capacitor of Problem $2?$

What is the maximum width of the depletion region, WT of Problem $2?$

Indicate qualitatively how your answers to part $($a$)$ would change if the substrate doping ND were to be decreased $($e$.$g$.,$ to $1017$ cm$-3).$

Indicate qualitatively how your answers to part $($a$)$ would change if the oxide thickness xo were to be increased $($e$.$g$.,$ to $3$ nm$).$