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D *8.80 Figure P8.80 shows four possible realizations of the folded cascode amplifier. Assume that the BJTs have β = 100 and that both the BJTs and the MOSFETs have VA = 5 V. Let I = 100 μA, and assume that the MOSFETs are operating at VOV = 0.2 V. Assume the current sources are ideal. For each circuit determine R in, Ro, and Av o. Comment on your results.