QUESTION $3$

For a prototype OpAmp below $($differential $$amplifier cascaded with Common$-$emmiter and Common$-$Drain$),$given assume all MOSFET transistors have $=0\mathrm{.}02$V$,$and given gm$2=$gm$6$

$=$gm$7=$gm$8=5$mS$,$gm$9=8$mS$.$For MOSFET rO$=1$$+|$VDS$|$IDS

At $$quiesent condition $($v$1=$v$2=$vO$=0),$VGS$1=$VGS$2$~$=2$V$,$Vds$6$~$=3$V$,$Vds$3$~$=6$V$,$and Vds$4=5$V$.$

For PNP $$transistor Q$12,$assume $|$VBE$|$~$=0\mathrm{.}7$V$,$$=100,$VA$=50$V$.$

Determine$$WL $$for M$2$