Consider the circuit shown in Fig. P6.65. It resembles that in Fig. 6.30 but includes

Chapter 6, Problem 6.65

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Consider the circuit shown in Fig. P6.65. It resembles that in Fig. 6.30 but includes other features. First, note diodes D1 and D2 are included to make design (and analysis) easier and to provide temperature compensation for the emitterbase voltages of Q1 and Q2. Second, note resistor R, whose purpose is to provide negative feedback (more on this later in the book!). Using VBE and VD = 0.7 V independent of current, and =, find the voltages VB1, VE1, VC1, VB2, VE2, and VC2, initially with R open-circuited and then with R connected. Repeat for =100, with R open-circuited initially, then connected. 80 k 40 k 2 k 2 k 2 k 100 100 9 V Q 2 D 2 R D 1 Q 1 Figure P6.65

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