The circuit Shown in Fig. EI0.11 consists of a differential stage followed by an

Question

The circuit Shown in Fig. EI0.11 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 V, is zero, and that beta of the BJTs is very high, find the dc operating current of each of the three transistors and show that the dc voltage at the output is approximately zero. Then find the values of A,beta,Ar v0/v1,Rin, and Rff. Assume that the transistors have beta = 100. Ans. 85.7 V/V; 0.1 V/V; 8.96 V/V; 191 kohm; 19.1 ohm. Figure E10.11

Explanation / Answer

Given Vs = 1V Vi = 10mV Vo = 10V A = Vo / Vi A = 10 / 0.01 A = 1000 Vi = Vs - Vf Vf = 1 - 0.01 Vf = 0.99V ß = Vf / Vo ß = 0.99 / 10 ß = 0.099 Af = Vo / Vs Af = 10 / 1 Af = 10

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