Problem $7.(15$ points$)$

a$)$ Draw the DC equivalent model and use it to find the quiescent operating parameters.

b$)$ Draw the AC equivalent model and use it to find Zin $,\backslash (\backslash$mathrm$\{$Zout$\},\backslash$mathrm$\{$Av$\},\backslash$mathrm$\{$Ai$\}\backslash ),$ and G $.$

c$)$ Compare Av and Zo in this problem with that of the similar Problem $6.$ Comment on the results, and state what application each would be best suited for.