Chapter 10, Problem 10.10EP

Consider the JFET circuit in Figure 10.24. The transistor parametersare: $I_{Dss2}=0.5mA,I_{Dss1}=0.8mA,V_{P1}=V_{P2}=-2V$ , and ${\lambda }_{P1}={\lambda }_{P2}=0.15V^{-1}$ . Determine the minimum values of $V_S$ and $V_I$ such that $Q_2$ is biased inthe saturation region. What is the value of $I_O$ ? What is the output impedance looking into the drain of $Q_2$ ? (Ans. $V_S\left(\min \right)=-3V,I_O=0.65mA,V_I\left(\min \right)=-3.2V,r_o=1.09k\Omega$ )