Problem $1.(15$ points$)$

A pn junction diode has a saturation current of $2$ nA$.$ Find answers for the following four problems:

a$)$ Determine the diode voltage if

$($i$)$ ID $=2$ A

$($ii$)$ ID $=20$ A

b$)$ Determine the diode current if

$($i$)$ VD $=0\mathrm{.}4$ V

$($ii$)$ VD $=0\mathrm{.}65$ V

c$)$ Leave a brief comment comparing the two values for parts a$)$ and b$)$ above. What do they tell you?