Question: The ac schematic of a common-emitter stage is shown in Fig. 7.2a. Calculate the low-frequency small-signal voltage gain Ï o /Ï i and use the

The ac schematic of a common-emitter stage is shown in Fig. 7.2a. Calculate the low-frequency small-signal voltage gain Ï…_o/Ï…_iand use the zerovalue time-constant method to estimate the ˆ’3-dB frequency for R_S= 10 kÎ© and R_L= 5 kÎ©. Data: Î² = 200, f_T= 600 MHz (at I_C= 1mA), C_Î¼= 0.2 pF, C_je= 2 pF, C_cs= 1 pF, r_b= 0, r_o= ˆž, and I_C= 1 mA.

Fig. 7.2 a:

RL Rs Vị

RL Rs V

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