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***6.65 Consider the circuit shown in Fig. P6.65. It resembles that in Fig. 6.30 but includes other features. First, note diodes D 1 and D 2 are included to make design (and analysis) easier and to provide temperature compensation for the emitter–base voltages of Q 1 and Q 2 . Second, note resistor R, whose purpose is to provide negative feedback (more on this later in the book!). Using V BE and V D = 0.7 V independent of current, and β=∞, find the voltages V B1 , V E1 , V C1 , V B2 , V E2 , and V C2 , initially with R open-circuited and then with R connected. Repeat for β=100, with R open-circuited initially, then connected.