In this note, Poly Notes Hub shares an article about the Advantages of Negative Voltage Feedback Circuit. Advantages like Gain Stability, Distortion, Frequency Response, and Impedance.
Author Name: Arun Paul.
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Advantages of Negative Voltage Feedback in Amplifiers
The following are the advantages of negative voltage feedback-
A. Gain Stability
An important advantage of negative voltage feedback is that the resultant gain of the amplifier can be made independent of transit parameters or supply voltage variations. As a feedback circuit is usually a voltage divider (a resistive network), therefore, it is unaffected by changes in temperature, variations in transistor parameters, and frequency. Hence, the gain of the amplifier is extremely stable.
B. Reduces Non-Linear Distortion
A large signal stage has non-linear distortion because its voltage gain changes at various points in the cycle. The negative voltage feedback reduces the non-linear distortion in large signal amplifiers.
C. Improve Frequency Responses
As feedback is usually obtained through a resistive network, therefore, voltage gain of the amplifier is independent of signal frequency. The result is that the voltage gain of the amplifier will be substantially constant over a wide range of signal frequencies. The negative voltage feedback, therefore, improves the frequency response of the amplifier.
D. Increases Circuit Stability
The output of an ordinary amplifier is easily changed due to variations in ambient temperature, frequency, and signal amplitude. This changes the gain of the amplifier, resulting in distortion. However, by applying negative voltage feedback, the amplifier’s voltage gain is stabilized or accurately fixed in value. This can be easily explained. Suppose the output of a negative voltage feedback amplifier has increased because of temperature change or due to some other reason. This means more negative feedback since feedback is being given from the output. This tends to oppose the increase in amplification and maintains it stable. The same is true should the output voltage decrease. Consequently, the circuit stability is considerably increased.
E. Increase input impedance and decreases output impedance
The negative voltage feedback increases the input impedance and decreases the output impedance of the amplifier. Such a change is profitable in practice as the amplifier can then serve the purpose of impedance matching.
Conclusion | Diploma Engineering Notes | Poly Notes Hub
In this note, we are discussing the Advantages of Negative Voltage Feedback in Amplifiers. The advantages like gain stability, Non-Linear Distortion, and many more. Our Poly Notes Hub provides syllabus-wise notes for polytechnic or diploma engineering students of streams like Electrical Engineering, Electronics Engineering, Electrical and Electronics Engineering, Electronics & Instrumentation Engineering, and Computer Science & Technology. Our website is updating day by day so keep in touch with us for new and syllabus-wise notes and topic which helps you all to do any task regarding diploma engineering.
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