Chapter 8, Problem 8.46P

Consider the class−AB MOSFET output stage shown in Figure P8.46. The circuit meters are $I_{Biass}=0.2\text{mA}$ and $R_L=1\text{k}\Omega$ . The transistor parameters are $k_n^{\text{'}}=100\mu {\text{A/V}}^{\text{2}}$ , $k_p^{\text{'}}=40\mu {\text{A/V}}^{\text{2}}$ , $V_{TN}=0.8\text{V}$ , and $V_{TP}=-0.8\text{V}$ . For the quiescent condition, assume ${\upsilon }_{GS3}={\upsilon }_{GS4}$ and ${\upsilon }_{GS1}={\upsilon }_{GS2}$ . When ${\upsilon }_I=-1.5\text{V}$ , ${\upsilon }_O=0$ and $i_{D1}=i_{D2}=0.5\text{mA}$ . Determine the width−to−length ratio of each transistor.

Figure P8.46