Feedback practice problems
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An amplifier used in a feedback system has a nominal open-loop gain of A = 1.0e+4. In a batch of amplifiers, the variance of the open-loop gain is known to be ±20%. The feedback network used has nominal factor of β = 0.125. The variance of the feedback factor is ±15%. If we build 10000 versions of the closed-loop circuits using the imperfect amps and the imperfect feedback networks, what are the minimum and maximum values for closed-loop gains that we would expect to see?