QUESTION $3$

$[5$ Marks $]$

For the circuit in Figure $3,$ the transistor parameters are: $VDD=12V,Kn=0\mathrm{.}5m\frac{A}{V^2},VTN=2V,$ and $=0\mathrm{.}02V^{-1}.$

a$)$ Calculate the current $I_{DQ}$ and $V_{SDQ}$

b$)$ Determine the small$-$signal parameter $g_m.$

c$)$ Draw the AC small signal equivalent circuit.

d$)$ Find the small$-$signal voltage gain$($ note: neglect Ri$).$

rigure $5$