Chapter 7, Problem 7.3TYU

The parameters in the circuit shown in Figure 7.15 are $R_S=100\text{Ω}$ , $r_{\pi }=2.4\text{kΩ}$ , $g_m=50\text{mA/V}$ , $R_L=10\text{kΩ}$ , $C_C=5\text{μF}$ ,and $C_L=4\text{pF}$ .(a)Findtheopen-circuit and short-circuit time constants. (b) Calculate the midband voltage gain.(c) Determine the lower and upper 3 dB frequencies. (Ans. (a) ${\tau }_S=12.5\text{ms}$ , ${\tau }_P=0.04\mu \text{s}$ ; (b) $A_{\upsilon }=-480$ ; (c) $f_L=12.7\text{Hz}$ , $f_H=3.98\text{MHz}$ )

Figure 7.15 Figure for Exercise TYU 7.3