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An amplifier with a positive feedback circuit causes ____

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RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. bandwidth to stabilize
  2. gain of an amplifier to stabilize
  3. bandwidth to decrease 
  4. bandwidth to increase 

Answer (Detailed Solution Below)

Option 3 : bandwidth to decrease 
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Detailed Solution

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Positive feedback

The structure of the feedback is shown below

  • In the positive feedback, the gain is increased and the bandwidth is reduced. 
  • In the positive feedback, the error also diverges.
  • It is also called the “Regenerative circuit". 

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