Consider the Darlington pair and emitter-follower portions of the circuit in Figure 11.46. The parameters are: IC7 = IQ = 0.5 mA, IC8 = 2 mA, R4 = 5 kΩ and R3 = 0.1 kΩ. For all transistors, the current gain is β = 120, and for Q11 and Q7, the Early voltage is VA = 120 V. Calculate the input resistance and small-signal voltage gain of the Darlington pair, and the output resistance of the emitter follower.
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