A CMOS amplifier is shown in Figure $3.$ PMOS transistors M$1$ and M$2$ have $\backslash$mu pCox $=30\backslash$mu A$/$V$2,$ Vtp $=-0\mathrm{.}4$ V$,|1/\backslash$lambda p$|=100$ V$,$ W $=480\backslash$mu m and L $=1\mathrm{.}6\backslash$mu m$.$ The NMOS transistor M$0$ has parameters $\backslash$mu nCox $=90\backslash$mu A$/$V$2,$ Vtn $=0\mathrm{.}4$ V$,1/\backslash$lambda n $=100$ V$,$ W $=160\backslash$mu m and L $=1\mathrm{.}6\backslash$mu m$.$ VDD $=5$ V and Rref $=100$ k$\backslash$Omega