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Questions and Answers
What is the effect of positive feedback on the gain of an amplifier?
What is the effect of positive feedback on the gain of an amplifier?
- Reduces the gain
- Has no effect on the gain
- Stabilizes the gain
- Increases the gain (correct)
Which type of feedback is commonly used in amplifiers?
Which type of feedback is commonly used in amplifiers?
- Degenerate feedback
- Positive feedback
- Regenerative feedback
- Negative feedback (correct)
What is the characteristic of the feedback energy in positive feedback?
What is the characteristic of the feedback energy in positive feedback?
- Out of phase with the input signal
- In phase with the input signal (correct)
- Amplifies the input signal
- Has no phase relationship with the input signal
Why is positive feedback seldom employed in amplifiers?
Why is positive feedback seldom employed in amplifiers?
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What does negative feedback do to the gain of an amplifier?
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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