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Analog ElectronicsFeedback Amplifiers

If negative feedback reduces an amplifier’s gain by a factor of 10 while approximately preserving gain-bandwidth product, its bandwidth ideally changes by roughly what factor?

  • ADecreases by 10
  • BIncreases by 10
  • CDoes not change
  • DIncreases by 100
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Correct Answer: B. Increases by 10
Explanation: Negative feedback commonly trades gain for bandwidth; under the constant gain-bandwidth approximation, a tenfold gain reduction gives about tenfold bandwidth increase.
Reference: Standard analog electronics: feedback bandwidth
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