The small-signal parameters of the NMOS transistor in the ac equivalent common-gate circuit shown in Figure P4.47

Question:

The small-signal parameters of the NMOS transistor in the ac equivalent common-gate circuit shown in Figure P4.47 are $V_{T N}=0.4 \mathrm{~V}, k_{n}^{\prime}=100 \mu \mathrm{A} / \mathrm{V}^{2}$, $W / L=80$, and $\lambda=0$. The quiescent drain current is $I_{D Q}=0.5 \mathrm{~mA}$. Determine the small-signal voltage gain and the input resistance.

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