Figure 7.4.1
The MOSFET in the circuit of Fig. 7.4.1 has $\mu_{n} C_{o x}(W / L)=4 \mathrm{~mA} / \mathrm{V}^{2}$.
(a) Find the value of $I$ that causes the MOSFET to operate in saturation with an overdrive voltage of $0.25 \mathrm{~V}$.
(b) What value of $R_{D}$ results in $V_{D}=0 \mathrm{~V}$ ?
(c) Find the value of $g_{m}$.
(d) Find the value of $r_{o}$ given that $V_{A}=25 \mathrm{~V}$.
(e) If $R_{\text {in }}$ is to be $1 \mathrm{M} \Omega$, find the value that $R_{G}$ must have. (f) For $R_{\text {sig }}=1 \mathrm{M} \Omega$ and $R_{L}=40 \mathrm{k} \Omega$, find the value of the overall voltage gain $v_{o} / v_{\text {sig }}$.
(g) What does the voltage gain become if $C_{S}$ is removed?

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The Answer of

Figure 7.4.1
The MOSFET in the circuit of Fig. 7.4.1 has $\mu_{n} C_{o x}(W / L)=4 \mathrm{~mA} / \mathrm{V}^{2}$.
(a) Find the value of $I$ that causes the MOSFET to operate in saturation with an overdrive voltage of $0.25 \mathrm{~V}$.
(b) What value of $R_{D}$ results in $V_{D}=0 \mathrm{~V}$ ?
(c) Find the value of $g_{m}$.
(d) Find the value of $r_{o}$ given that $V_{A}=25 \mathrm{~V}$.
(e) If $R_{\text {in }}$ is to be $1 \mathrm{M} \Omega$, find the value that $R_{G}$ must have. (f) For $R_{\text {sig }}=1 \mathrm{M} \Omega$ and $R_{L}=40 \mathrm{k} \Omega$, find the value of the overall voltage gain $v_{o} / v_{\text {sig }}$.
(g) What does the voltage gain become if $C_{S}$ is removed?

Figure 741 the MOSFET in the Circuit of Fig μnCox(W/L)=4 mA/V2\mu_{n} C_{o x}(W / L)=4 \mathrm{~mA} / \mathrm{V}^{2}μn​Cox​(W/L)=4 mA/V2

Figure 741
the MOSFET in the Circuit of Fig $\mu_{n} C_{o x}(W / L)=4 \mathrm{~mA} / \mathrm{V}^{2}$