Design of a Simple Class A Output Stage

Use the values of below Table and design the $W / L$ ratios of M1 and M2 so that a voltage swing of $\pm 2 \mathrm{~V}$ and a slew rate of $\sim 1 \mathrm{~V} / \mu \mathrm{s}$ is achieved if $R_L=20 \mathrm{k} \Omega$ and $C_L=1000 \mathrm{pF}$. Assume that $V_{D D}=-\left|V_{S S}\right|=3 \mathrm{~V}$ and $V_{G G 2}=0 \mathrm{~V}$. Let the channel lengths be $2 \mu \mathrm{~m}$ and assume that $C_{g d 1}=100 \mathrm{fF}$.

\begin{tabular}{|l|l|l|l|l|}

\hline \multirow[b]{2}{*}{Parameter Symbol} & \multirow[b]{2}{*}{Parameter Description} & \multicolumn{2}{|c|}{Typical Parameter Value} & \multirow[b]{2}{*}{Units} \\

\hline & & n-Channel & p-Channel & \\

\hline $V_{T 0}$ & Threshold voltage ( $V_{B S}=0$ ) & $0.7 \pm 0.15$ & $-0.7 \pm 0.15$ & V \\

\hline $K^{\prime}$ & Transconductance parameter (in saturation) & $110.0 \pm 10 \%$ & $50.0 \pm 10 \%$ & $\mu \mathrm{A} / \mathrm{V}^2$ \\

\hline $\gamma$ & Bulk threshold parameter & 0.4 & 0.57 & $\mathrm{V}^{1 / 2}$ \\

\hline $\lambda$ & Channel length modulation parameter & $0.04(L=1 \mu \mathrm{~m}) 0.01(L=2 \mu \mathrm{~m})$ & $0.05(L=1 \mu \mathrm{~m}) 0.01(L=2 \mu \mathrm{~m})$ & $\mathrm{V}^{-1}$ \\

\hline & & & & \\

\hline $2\left|\phi_F\right|$ & Surface potential at strong inversion & 0.7 & 0.8 & V \\

\hline

\end{tabular}