Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > The band width, in a feedback amplifier.a)Rem...
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The band width, in a feedback amplifier.
- a)Remains unaffected
- b)Decreases by the same amount as the gain increase
- c)Increases by the same amount as the gain decrease
- d)Decreases by the same amount as the gain decrease
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
The band width, in a feedback amplifier.a)Remains unaffectedb)Decrease...
Explanation: The bandwidth is defined as the difference in the higher frequency to the input frequency and increase in the bandwidth leads to the noise and in a feedback amplifier increases by the same amount as the gain decreases.
Most Upvoted Answer
The band width, in a feedback amplifier.a)Remains unaffectedb)Decrease...
Bandwidth in Feedback Amplifier
Bandwidth is defined as the range of frequencies over which an electronic circuit can operate effectively. In a feedback amplifier, the gain of the amplifier is reduced to achieve stability and to avoid oscillations. This reduction in gain affects the bandwidth of the amplifier.
Effect of Gain Change on Bandwidth
When the gain of a feedback amplifier is reduced, the bandwidth of the amplifier increases. Similarly, when the gain of the amplifier increases, the bandwidth of the amplifier decreases. The change in bandwidth is directly proportional to the change in gain.
Explanation
The feedback network in an amplifier reduces the overall gain of the amplifier. This reduction in gain is achieved by feeding back a portion of the output signal to the input. This feedback signal is out of phase with the input signal and reduces the overall gain of the amplifier.
The feedback network also introduces phase shift, which can affect the frequency response of the amplifier. The frequency at which the gain of the amplifier is reduced by 3 dB is known as the bandwidth of the amplifier.
When the gain of the amplifier is reduced, the feedback signal becomes weaker, and the overall feedback factor decreases. This results in a decrease in the amount of phase shift introduced by the feedback network. As a result, the bandwidth of the amplifier increases.
On the other hand, when the gain of the amplifier is increased, the feedback signal becomes stronger, and the overall feedback factor increases. This results in an increase in the amount of phase shift introduced by the feedback network. As a result, the bandwidth of the amplifier decreases.
Conclusion
The bandwidth of a feedback amplifier is directly proportional to the amount of gain reduction in the amplifier. When the gain of the amplifier is reduced, the bandwidth of the amplifier increases, and when the gain of the amplifier is increased, the bandwidth of the amplifier decreases.
Bandwidth is defined as the range of frequencies over which an electronic circuit can operate effectively. In a feedback amplifier, the gain of the amplifier is reduced to achieve stability and to avoid oscillations. This reduction in gain affects the bandwidth of the amplifier.
Effect of Gain Change on Bandwidth
When the gain of a feedback amplifier is reduced, the bandwidth of the amplifier increases. Similarly, when the gain of the amplifier increases, the bandwidth of the amplifier decreases. The change in bandwidth is directly proportional to the change in gain.
Explanation
The feedback network in an amplifier reduces the overall gain of the amplifier. This reduction in gain is achieved by feeding back a portion of the output signal to the input. This feedback signal is out of phase with the input signal and reduces the overall gain of the amplifier.
The feedback network also introduces phase shift, which can affect the frequency response of the amplifier. The frequency at which the gain of the amplifier is reduced by 3 dB is known as the bandwidth of the amplifier.
When the gain of the amplifier is reduced, the feedback signal becomes weaker, and the overall feedback factor decreases. This results in a decrease in the amount of phase shift introduced by the feedback network. As a result, the bandwidth of the amplifier increases.
On the other hand, when the gain of the amplifier is increased, the feedback signal becomes stronger, and the overall feedback factor increases. This results in an increase in the amount of phase shift introduced by the feedback network. As a result, the bandwidth of the amplifier decreases.
Conclusion
The bandwidth of a feedback amplifier is directly proportional to the amount of gain reduction in the amplifier. When the gain of the amplifier is reduced, the bandwidth of the amplifier increases, and when the gain of the amplifier is increased, the bandwidth of the amplifier decreases.
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