Chapter 5, Problem 5.16TYU

[Note: In the following exercises, assume the B—E cut−in voltage is 0.7V. Also assume the C−E saturation voltage is 0.2V.]

Figure 5.53 Figure for Exercise TYU 5.15 and TYU 5.16

For the circuit shown in Figure 5.53, let $R_B=800\text{k}\Omega$ . If the range of $\beta$ is between 75 and 150, determine a new value of $R_C$ such that the Q−point will always be in the range $1\le V_{CEQ}\le 4\text{V}$ . What will be the actual range of $V_{CEQ}$ for the new value of $R_C$ ? (Ans. For $V_{CEQ}=2.5\text{V}$ , $R_C=4.14\text{k}\Omega$ ; (b) $1.66\le V_{CEQ}\le 3.33\text{V}$ )