P $2.$ Consider a CMOS process for which Lmin $=0\mathrm{.}25$ m$,$ tox$=6$nm$,$ n $=460$cm$2/$Vs$,$ and Vt $=0\mathrm{.}5$V$.$ a$)$ Find Cox and k$$n$.$ b$)$ For an NMOS transistor with W$/$L $=20$ m$/0\mathrm{.}25$ m$,$ calculate the values of VOV $,$ VGS$,$ and VDSmin needed to operate the transistor in the saturation region with a dc current ID $=0\mathrm{.}5$ mA$.$ c$)$ For the device in $($b$),$ find the value of VOV and VGS required to cause the device to operate as a $100-$ resistor for very small vDS$.$