Analog and electronic circuits

What is the effect of applying negative feedback to an amplifier?

  1. AGain is reduced, but gain stability improves, bandwidth widens and distortion decreases
  2. BGain becomes infinite
  3. CIt always starts to oscillate
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Answer: A. Gain is reduced, but gain stability improves, bandwidth widens and distortion decreases

Negative feedback subtracts part of the output from the input, so the gain decreases. In return, gain variations due to component spread and temperature shrink, the bandwidth widens and distortion is reduced. Op-amp circuits are designed on the premise of negative feedback.

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