Chapter 7, Problem 7.2TYU

The equivalent circuit in Figure 7.14 has circuit parameters $R_S=100\text{Ω}$ , $r_{\pi }=2.4\text{kΩ}$ , $g_m=50\text{mA/V}$ , $R_L=10\text{kΩ}$ , and $C_L=2\text{pF}$ . (a) Determine theexpression for and the value of the circuit time constant. (b) Calculate the 3 dB frequency and the maximum voltage gain. (c) Sketch the Bode plot of the transferfunction magnitude. (Ans. (a) $\tau =R_L{C}_L=0.02\mu \text{s}$ ; (b) $f_{\text{3dB}}=7.96\text{MHz}$ , $\left|A_{\upsilon }\right|=480$ )

Figure 7.14 Figure for Exercise TYU 7.2