Example: $3($Assignment$)$

Consider the cascode amplifier of Fig. $4$ with the dc component at the input, $V_{\text{I}}=0\mathrm{.}7V,V_{G2}=1\mathrm{.}0V,V_{G3}=0\mathrm{.}8V,V_{G4}=1\mathrm{.}1$ VG$4=1\mathrm{.}1$V $,$ and $V_{DD}=1\mathrm{.}8V.$

If all devices are matched $($i$.$e$.,$ if $k_{n1}=k_{n2}=k_{p3}=k_{p4}4,$ and have equal $|V_t||$ of $0\mathrm{.}5$ V $,$ what is the overdrive voltage at which the four transistors are operating? What is the allowable voltage range at the output?

Fig. $4$