16.31 Consider the CMOS inverter in Figure 16.21 biased at VDD = 2.5 V. The transistor parameters are VTN = 0.4 V, VTP = −0.4 V, and Kn = Kp = 100 μA/V2. (a) Find the transition points for the p-channel and n-channel transistors. (b) Sketch the voltage transfer characteristics, including the appropriate voltage values at the transition points. (c) Determine vO for vI = 1.1 V and vI = 1.4 V. Figure P16.21