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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.
- 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.
- 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 follow...
Introduction:
In an amplifier, negative feedback is a technique used to improve the performance and stability of the system. It involves feeding a portion of the output signal back to the input with an opposite phase. This feedback signal serves to reduce distortion, increase linearity, and improve the overall characteristics of the amplifier.
Explanation:
When negative feedback is applied to an amplifier, it affects various parameters of the amplifier circuit, including voltage gain, current gain, bandwidth, and input/output impedance. Let's discuss each of these parameters in detail.
1. Voltage Gain:
Negative feedback reduces the voltage gain of an amplifier. This is because the feedback signal is subtracted from the input signal, thereby reducing the overall voltage gain. The amount of voltage gain reduction depends on the feedback factor, which is the ratio of the feedback signal to the output signal. As the feedback factor increases, the voltage gain of the amplifier decreases.
2. Current Gain:
Negative feedback also reduces the current gain of an amplifier. Similar to voltage gain, the feedback signal is subtracted from the input signal, resulting in a reduction in the overall current gain. The amount of current gain reduction depends on the feedback factor.
3. Bandwidth:
Negative feedback decreases the bandwidth of an amplifier. This is because the feedback signal introduces a phase shift that limits the frequency response of the amplifier. As the feedback factor increases, the bandwidth decreases, leading to a narrower range of frequencies over which the amplifier can operate effectively.
Conclusion:
In summary, negative feedback in an amplifier leads to a decrease in both voltage gain and current gain, as well as a decrease in bandwidth. This technique is commonly used in amplifier design to achieve improved performance and stability.
In an amplifier, negative feedback is a technique used to improve the performance and stability of the system. It involves feeding a portion of the output signal back to the input with an opposite phase. This feedback signal serves to reduce distortion, increase linearity, and improve the overall characteristics of the amplifier.
Explanation:
When negative feedback is applied to an amplifier, it affects various parameters of the amplifier circuit, including voltage gain, current gain, bandwidth, and input/output impedance. Let's discuss each of these parameters in detail.
1. Voltage Gain:
Negative feedback reduces the voltage gain of an amplifier. This is because the feedback signal is subtracted from the input signal, thereby reducing the overall voltage gain. The amount of voltage gain reduction depends on the feedback factor, which is the ratio of the feedback signal to the output signal. As the feedback factor increases, the voltage gain of the amplifier decreases.
2. Current Gain:
Negative feedback also reduces the current gain of an amplifier. Similar to voltage gain, the feedback signal is subtracted from the input signal, resulting in a reduction in the overall current gain. The amount of current gain reduction depends on the feedback factor.
3. Bandwidth:
Negative feedback decreases the bandwidth of an amplifier. This is because the feedback signal introduces a phase shift that limits the frequency response of the amplifier. As the feedback factor increases, the bandwidth decreases, leading to a narrower range of frequencies over which the amplifier can operate effectively.
Conclusion:
In summary, negative feedback in an amplifier leads to a decrease in both voltage gain and current gain, as well as a decrease in bandwidth. This technique is commonly used in amplifier design to achieve improved performance and stability.
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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 gainc)Decrease in voltage gaind)Decrease in bandwidthCorrect answer is option 'C'. Can you explain this answer?
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