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with $V^+ = 10V$ and $V^- = 0$ and the transistor parameters are: $V_{TN} = 1.8 V, 1/2\mu_nC_{ox} = 20 \mu A/V^2$ and $\lambda = 0.01 V^{-1}$. The transistor width to width ratios are: $(W/L)_2 = 6, (W/L)_1 = 12, (W/L)_3 = 3$. Determine (i) $I_{REF}$ (ii)$I_o$ at $V_{DS2} = 2V$