For a prototype OpAmp below $($differential amplifier cadcaded 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 $102=2mA,103=2mA,104=10mA,$ assume all MOSFET transistors have $=\frac{0\mathrm{.}02}{V},$ and given gm$2=9$m$6$

$=gm7=gm8=5ms,gm9=8ms.$ For MOSFET VDS $|||$

At quiesent condition $(V_1=v_2=v_0=0),V_{GS1}=V_{GS2}$~$=2V,Vd{s}_6$~$=3V,Vd{s}_C$~$=6V,$ and $Vds4=5V.$ For PNP transistor $Q_{12},$ assume $|V_{BE}|$~$=0\mathrm{.}7V,=100,V_A=50V.$

For the quiescent condition, determine ro$2$ in Kohm