Example: It is required to design the circuit as below to establish a DC drain current ID $=0\mathrm{.}5$ mA$.$ The MOSFET is specified to

have Vt $=1$ V and kn$$W$/$L $=1$mA$/$V$2.$ For simplicity, neglect the channel$-$length modulation effect $($i$.$e$.,$ assume $=0).$ Use a

power$-$supply VDD $=15$ V$.$ Calculate the percentage change in the value of ID obtained when the MOSFET is replaced with

another unit having the same kn$$W$/$L but Vt $=1\mathrm{.}5$ V$.$