The diff-amp in Figure 11.3 of the text has parameters V+ = +5 V, V− = −5 V, RC = 8 kΩ and IQ = 0.5 mA. The transistor parameters are β = 120, VBE(on) = 0.7 V, and VA = ∞. (a) Using Figure 11.3(a), determine the maximum common-mode input voltage vcm that can be applied such that the transistors Q1 and Q2 remain biased in the active region, (b) Using Figure 11.3(b), determine the change in vC2 from its dc value if vd = 18 mV. (c) Repeat part (b) if vd − 10 mV.
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