Chapter 16, Problem 16.7EP

The CMOS inverter in Figure 16.21 is biased at $V_{DD}=2.1\text{V}$ , and the transistor threshold voltages are $V_{TN}=-V_{TP}=0.4\text{V}$ . Sketch the voltage transfer curve and show the critical voltages as in Figure 16.26 for (a) $K_n/K_p=1$ , (b) $K_n/K_p=0.5$ , and (c) $K_n/K_p=2$ . (Ans. (a) $V_{It}=1.05\text{V}$ , $V_{OPt}=1.45\text{V}$ , $V_{ONt}=0.65\text{V}$ ; (b) $V_{It}=1.16\text{V}$ , $V_{OPt}=1.56\text{V}$ , $V_{ONt}=0.76\text{V}$ ; (c) $V_{It}=0.938\text{V}$ , $V_{OPt}=1.338\text{V}$ , $V_{ONt}=0.538\text{V}$ )