QUESTION $1$

For a prototype OpAmp below $($differential amplifier cascaded with Common$-$emmiter and Common$-$Drain$),$ given $VDD=5V,-VSS=-5V,$IREF$=0\mathrm{.}5mA,(\frac{W}{L}{)}_1=(\frac{W}{L})5=5.$ design requires $I{O}_{O2}=2mA,I_{O3}=2mA,IO4=10mA,$ assume all MOSFET transistors have $=\frac{0\mathrm{.}02}{V},$ and given $gm2=gm6=gm7=gm8=5mS,gm9=8mS.$ For MOSFET $r_o=\frac{\frac{1}{}+|VDS|}{\text{I}}D{S}_{DS}$ At quiesent condition