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Questions and Answers
What is the effect of positive feedback on the gain of an amplifier?
Which type of feedback is commonly used in amplifiers?
What is the characteristic of the feedback energy in positive feedback?
Why is positive feedback seldom employed in amplifiers?
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What does negative feedback do to the gain of an amplifier?
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Study Notes
Introduction to Feedback Amplifiers
- Feedback is the process of feeding a portion of the output signal back to the input circuit.
- It results in a dependence between the output and the input, allowing effective control in the circuit's operation.
- There are two types of feedback: positive feedback and negative feedback.
- Positive feedback involves feedback energy that is in phase with the input signal, aiding it and increasing the amplifier's gain.
- However, positive feedback also increases distortion, noise, and instability, so it is rarely used in amplifiers, although it is employed in oscillators.
- Negative feedback involves feedback energy that is out of phase with the input signal, opposing it and reducing the amplifier's gain.
- Negative feedback also reduces distortion and noise in the amplifier.
- Overall, while positive feedback increases gain but also introduces disadvantages, negative feedback reduces gain but improves amplifier performance in terms of distortion and noise.
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Description
Test your knowledge of feedback amplifiers with this quiz! Learn about the concepts of positive and negative feedback, and understand how they impact the performance of electronic circuits.
