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The negative feedback in an amplifier leads to which one of the following?
- a)Increase in current gain
- b)Increase in voltage gain
- c)Decrease in voltage gain
- d)Decrease in bandwidth
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
The negative feedback in an amplifier leads to which one of the follow...
The negative feedback in amplifiers causes:
- Reduced the gain and increases the stability in G.
- Increases the bandwidth to maintain constant gain-bandwidth product
- Reduces the distortion and noise in the amplifier
- The signal-to-noise ratio is not affected.
- The voltage gain (Av) of an amplifier is defined as the ratio of output voltage to the input voltage.
Av = Vo/Vin
Here, Vo is the output voltage of an amplifier and Vin is the input voltage of an amplifier.
Here, Vo is the output voltage of an amplifier and Vin is the input voltage of an amplifier.
- In a negative feedback amplifier, closed-loop voltage gain is given
Av = Vo / Vin = 1/(1+Aoβ)
Here, β = feedback factor,
Ao = open-loop gain of the amplifier.
Ao = open-loop gain of the amplifier.
- This expression clearly shows that closed-loop voltage gain has reduced by introducing negative feedback.
- We know that a product of gain and bandwidth is inversely proportional so here bandwidth of amplifier will increase ;
(gain × bandwidth = 0.35)
- A negative feedback amplifier decreases the current gain.
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The negative feedback in an amplifier leads to which one of the following?a)Increase in current gainb)Increase in voltage gainc)Decrease in voltage gaind)Decrease in bandwidthCorrect answer is option 'C'. Can you explain this answer?
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