An enhancement-mode NMOS transistor has parameters (V_{T N O}=0.8 mathrm{~V}), (gamma=0.8 mathrm{~V}^{1 / 2}), and (phi_{f}=0.35 mathrm{~V}).

Question:

An enhancement-mode NMOS transistor has parameters $V_{T N O}=0.8 \mathrm{~V}$, $\gamma=0.8 \mathrm{~V}^{1 / 2}$, and $\phi_{f}=0.35 \mathrm{~V}$. At what value of $V_{S B}$ will the threshold voltage change by $2 \mathrm{~V}$ due to the body effect?

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