Problem $10-(15$ Points$)$: $(5$ pts each$)$

Calculate I$\_($copy$)$ in each of the circuits shown below in $($a$)$ and $($b$).$ Assume all of the transistors

operate in saturation. Likewise, construct a schematic that can provide a I$\_($copy $)$ to a PMOS

common$-$source amplifier with current sink of $5\mathrm{.}8$ times of I$\_($REF$)$ provided in figure $($c$).$

$($a$)$

$($b$)$

$($c$)$