S$.2$ Design an OPAMP $($Multistage Amplifier$)$ with the following specifications: The OPAMP has two stages. You should provide a high input resistance and high current gain, and relatively low output resistance in the first stage and $\backslash (2^\{\backslash$text $\{$nd $\}\}\backslash )$ stage should provide inverting voltage gain, high input resistance and moderate output resistance. $\backslash (\backslash$chi$=0,$ K$\_\{$n$\}=$K$\_\{$p$\}=5\backslash$mathrm$\{$~mA$\}/\backslash$mathrm$\{$V$\}^\{2\}\backslash ),\backslash ($ V$\_\{$D D$\}=15\backslash$mathrm$\{$~V$\}\backslash ).($Devrenin $1.$ kat$$nda y$$ksek giri$$ direnci ve ak$$m kazanc$$ ve g$$receli d$$k $$k$$ direnci elde ederken, $2.$ kat$$nda evrilmi$($negatif$)$ gerilim kazanc$$ ve y$$ksek giri$$ direnci ve orta de$$erli $$k$$ direnci elde edecek $$ekilde $2$ kattan olu$$an $$ok$-$katl bir y$$kselte$$ devresi $($OPAMP$)$ tasarlay$$n$$z$)$

a$)(10$ p$)$ Explain which MOS amplifiers you should use in each step and draw the multistage amplifier circuit $($ok$-$katl amfinin her bir kat$$nda hangi y$$kselte$$ devresini kullanaca$$n$$z$$ belirtiniz ve devreyi $$iziniz$).$

b$)(10$ p$)$ Draw the small$-$signal ac equivalent circuit of the multistage amplifier with appropriate labels $($Tasarlam$$ oldu$$unuz $$ok katl$$ y$$kselte$$ devresine ait ac k$$k i$$aret e$$de$$er devresini $$iziniz ve gerekli parametreleri devre $$zerinde g$$steriniz$).$

c$)(20$ p$)$ Find the voltage gain $\backslash (\backslash$left$($A$\_\{$V$\}\backslash$right$)\backslash ),$ input and output resistances $(\backslash (\backslash$left$.$R$\_\{\backslash$text $\{$in $\}\}\backslash$& R$\_\{\backslash$text $\{$out $\}\}\backslash$right$)\backslash )$ of eachstage and also multi$-$stage amplifier circuit $($Her bir kata dair ve $$ok katl amfi devresine dair gerilim kazan$$lar$$n$$ ve giri$-$k$$ diren$$lerini bulunuz$).$ PLEASE DRAW C$$RCU$$T