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13.43 Consider the current-mirror active load Q3,4 in the two-stage op amp of Fig. 13.15 with R1 = 400 Ω. What value must R1 be increased to in order to increase its output resistance by a factor of 2? Assume that I1 = 50 μA and all transistors have β = 200 and VA = 125 V.
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