$3$a$.$ Given a two$-$stage cascaded amplifier where the input stage is the common collector $2-$Port Model from part $1,$ and the output stage is common base $2-$Port Model from part $2,$ find the following quantities:

$A_{V-Ni}$

$z_i$

Z$.$

$3$b$.$ Given a load resistance $R_L=110k,$ and a small$-$signal input voltage source $v_s=\frac{+}{-}2mV$ with a source resistance $R_s=50,$ draw the schematic of the $2-$Port Model of the cascaded amplifier:

$3$c$.$ Given the $2-$Port Model of the cascaded amplifier, find the following quantities:

Vin $$

$i_{in}$

Voul $$

iout $$