Chapter 11, Problem 11.85P

For the circuit shown in Figure $\text{P}11.85,$ determine the small-signal voltage gain, $A_v=v_o/v_i.$ Assume transistor parameters of $V_{TN}=1$ V, $K_n=$ $0.2\text{mA}/{\text{V}}^2,$ and $\lambda =0$ for $M_1$ and $\beta =80$ and $V_A=\infty$ for $Q_1$ .