Chapter 7, Problem 7.3EP

For the circuit shown in Figure 7.2 1(a), the parameters are: $V_{CC}=3\text{V}$ , $R_{Si}=0$ , $R_1=110\text{kΩ}$ , $R_2=42\text{kΩ}$ , $R_E=0.5\text{kΩ}$ , $R_C=7\text{kΩ}$ , and $C_C=0.47\mu \text{F}$ . The transistor parameters are $\beta =150$ , $V_{BE}\text{(on)}=0.7\text{V}$ , and $V_A=\infty$ .(a) Determine the expression for and the value of the time constant ${\tau }_S$ . (b) Determine the comer frequency and midband voltage gain. (Ans. (a) ${\tau }_S=R_i{C}_C=10.87\text{ms}$ ; (b) $f_L=14.6\text{Hz}$ , $A_{\upsilon }=-10.84$ )