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Figure P9.98 shows a differential cascode amplifier with an active load formed by a Wilson current mirror. Utilizing the expressions derived in Chapter 8 for the output resistance of a bipolar cascode and the output resistance of the Wilson mirror, and assuming all transistors to be identical, show that the differential voltage gain Ad is given approximately by Evaluate A_d for the case of beta = 100 and V_A = 20 V.
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