Figure P12.35 shows a variant of the class AB circuit of Fig. 12.17. Assume that all
Chapter 12, Problem 12.35(choose chapter or problem)
Figure P12.35 shows a variant of the class AB circuit of Fig. 12.17. Assume that all four transistors are matched and have = 100. (a) For vI = 0, find the quiescent current in Q3 and Q4, the input current iI , and the output voltage vO. (b) Since the circuit has perfect symmetry, the small-signal performance around vI =0 can be determined by considering either the top or bottom half of the circuit only. In this case, the load on the half-circuit must be 2RL, the input resistance found is 2Rin, and the output resistance found is 2Rout. Using this approach, find Rin, vo/vi , and Rout (assuming that the circuit is fed with a zero-resistance source). Q3 vI vO iI VCC 1 mA Q4 Q1 VCC VCC VCC 1 mA Q2 RL 200 Figure P12.35 12
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