Consider the diff-amp in Figure 11.2, with parameters V+ = 5V, V− = −5 V, and IQ = 0.4 mA. (a) Redesign the circuit such that the common mode input voltage is in the range −3 ≤ vcm ≤ 3 V, while Q1 and Q2 remain biased in the forward-active region, (b) Using the results of part (a), find the differential- mode voltage gain Ad — (vC2 — vC1)/vd.
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