Consider the circuit in Figure 8. $\mu_nC_{ox} = 0.2mA/V^2$, $I_0 = 1$ mA, $V_{DD} = 6$ V, $R_1 = R_2 = 2$ k$\Omega$, $V_{tn} = 1$V.
a) Size $M_1$ and $M_2$ such that $M_1$ is in saturation with a margin of 500 mV, and $g_{M1}$ =1mS.
b) Find the incremental resistances $r_1$ and $r_2$.
Figure 8