Exam Question
With the aid of a block diagram, briefly describe the effect which negative voltage feedback has on an amplifier and state the advantages resulting from the use of negative feedback. (16)
Class 4 (4th Engineer)
MET
📅 Jul 2023
Reference Answer
### Principle of Negative Voltage Feedback
Negative voltage feedback is a fundamental technique in amplifier design where a fraction of the output voltage signal is fed back to the input, but in the opposite phase (180° phase shift). This feedback signal is subtracted from the original input signal, effectively reducing the net input to the amplifier. While this reduces the overall gain, it significantly improves the amplifier's performance in several key areas, making it more stable, predictable, and linear.
### Block Diagram and Operation
The operation can be understood using a standard block diagram:
Negative voltage feedback is a fundamental technique in amplifier design where a fraction of the output voltage signal is fed back to the input, but in the opposite phase (180° phase shift). This feedback signal is subtracted from the original input signal, effectively reducing the net input to the amplifier. While this reduces the overall gain, it significantly improves the amplifier's performance in several key areas, making it more stable, predictable, and linear.
### Block Diagram and Operation
The operation can be understood using a standard block diagram:
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