The diff-amp in Figure P11.34 has parameters \(V^{+}=3 \mathrm{~V}, V^{-}=-3 \mathrm{~V}\), and \(I_{Q}=0.18 \mathrm{~mA}\). The transistor parameters are \(V_{T N}=0.35 \mathrm{~V}, k_{n}^{\prime}=\) \(100 \mu \mathrm{A} / \mathrm{V}^{2}, W / L=4\), and \(\lambda=0\).

(a) Using Figure P11.34(a), determine \(R_{D}\) such that the maximum value of the common-mode input voltage is \(v_{c m}(\max )=2.25 \mathrm{~V}\). The input transistors \(M_{1}\) and \(M_{2}\) must remain biased in the saturation region.

(b) Using Figure P11.34(b), determine the value of \(v_{D 2}\) for (i) \(v_{d}=0\), (ii) \(v_{d}=+120 \mathrm{mV}\), and (iii) \(v_{d}=-50 \mathrm{mV}\).

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