The parameters of the transistors in the circuit in Figure P10.68 are \(V_{T N}=0.8 \mathrm{~V}, V_{T P}=-0.8 \mathrm{~V}, k_{n}^{\prime}=100 \mu \mathrm{A} / \mathrm{V}^{2}, k_{p}^{\prime}=60 \mu \mathrm{A} / \mathrm{V}^{2}\), and \(\lambda_{n}=\lambda_{p}=0\). The transistor \((W / L)\) ratios are given in the figure. For \(R=100 \mathrm{k} \Omega\), determine \(I_{\text {REF }}, I_{1}, I_{2}, I_{3}\), and \(I_{4}\).

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V+ = +12 V IRFF () (H) R () 0.8 (1.25) (#) Figure P10.68 V = -12 V