Question: The ac schematic of a shunt-series feedback amplifier is shown in Fig. 8.31. Element values are R F = 1 kÎ©, R E = 100

The ac schematic of a shunt-series feedback amplifier is shown in Fig. 8.31. Element values are R_F= 1 kÎ©, R_E= 100 Î©, R_L1= 4 kÎ©, R_S= 1/_yS= 1 kÎ©, and z_L= 0. Device data: Î² = 200, r_b= 0, I_C1= I_C2= 1 mA, V_A= 100 V.

(a) Calculate the overall gain i_o/i_i, the loop transmission, and the input and output impedances at low frequencies.

(b) If the value of R_L1 changes by +10 percent, what is the approximate change in overall transmission and input impedance?

Fig. 8.31:

Q2 Z1. i, a2 Ys is RE Rf Feedback network

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