It is required to find the input resistance and the voltage gain of the input stage
Chapter 13, Problem 13.82(choose chapter or problem)
It is required to find the input resistance and the voltage gain of the input stage shown in Fig. 13.37. Let VICM 0.8 V so that the Q3Q4 pair is off. Assume that Q5 supplies 8 A, that each of Q7 to Q10 is biased at 8 A, and that all four cascode transistors are operating in the active mode. The input resistance of the second stage of the op amp is 1.5 M. The emitter-degeneration resistances are R7 = R8 = 22 k, and R9 = R10 = 33 k. [Hint: Refer to Fig. 13.38.] D
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