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You have an amplifer with a nominal open-loop gain of 1000 (A = 1000), but the variance in the gain is 20% (meaning that the open-loop gain ranges in value from 800 to 1200). You want to use feedback to try to desensitize the gain and you are willing to have the nominal closed-loop gain be 20 (G = 20).

• What value of feedback factor should you use to go from the nominal open-loop gain to the nominal closed loop gain??

• What will be the variance in the closed-loop gain of the amps, assuming that the feedback factor is exact (i.e. there is no variance in beta)?

Gmin = __________________________ Gmax = __________________________

• What will be the variance in the closed-loop gain of the amps, if feedback factor has 10% variance (as would be the case if you were using the resistors from your lab kit to build the feedback network)? Hint: Look for the worst-case scenarios.?

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M9699831

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