(a) A CMOS inverter is biased at \(V_{D D}=2.5 \mathrm{~V}\). The transistor parameters are \(K_{n}=K_{p}=120 \mu \mathrm{A} / \mathrm{V}^{2}, V_{T N}=0.4 \mathrm{~V}\), and \(V_{T P}=-0.4 \mathrm{~V}\). Calculate and plot the current in the transistors as a function of the input voltage for \(0 \leq v_{I} \leq 2.5 \mathrm{~V}\).

(b) Repeat part (a) for \(V_{D D}=1.8 \mathrm{~V}\) and \(0 \leq v_{I} \leq 1.8 \mathrm{~V}\).