11.7 The circuit shown in Fig. E11.17 consists of a differential stage followed by an emitter follower, with series–shunt feedback supplied by the resistors R1 and R2. Assuming that the dc component of Vs is zero, and neglecting the base currents of the BJTs, show that the dc voltage at the output is approximately zero and find the dc operating current of each of the three transistors. Then find the values of A, β, Af ≡ Vo/Vs, Rin, and Rout. Assume that the transistors have β = 100.

0.5 mA, 0.5 mA, 5 mA; 85 V/V; 0.1 V/V; 8.95 V/V; 189.5 kΩ; 19.2 Ω.

11.7 The circuit shown in Fig. E11.17 consists of a differential stage followed by an emitter follower, with series–shunt feedback supplied by the resistors R1 and R2. Assuming that the dc component of Vs is zero, and neglecting the base currents of the BJTs, show that the dc voltage at the output is approximately zero and find the dc operating current of each of the three transistors. Then find the values of A, β, Af ≡ Vo/Vs, Rin, and Rout. Assume that the transistors have β = 100.

0.5 mA, 0.5 mA, 5 mA; 85 V/V; 0.1 V/V; 8.95 V/V; 189.5 kΩ; 19.2 Ω.

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