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In an oscillator if phase of feedback is same as that of oscillation waveform then feedback is called ___________
- a)Positive feedback
- b)Negative feedback
- c)Cannot be predicted
- d)Either positive or negative depending upon frequency
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
In an oscillator if phase of feedback is same as that of oscillation w...
Understanding Feedback in Oscillators
In oscillators, feedback plays a crucial role in determining the stability and behavior of the system. The type of feedback can significantly influence whether the oscillator sustains oscillations or not.
Positive Feedback Explained
- Positive feedback occurs when the phase of the feedback signal aligns with the phase of the oscillation waveform.
- This alignment reinforces the oscillations, causing them to grow in amplitude.
- In simple terms, as the output increases, the feedback also increases, which leads to a continuous cycle of amplification.
Role of Positive Feedback in Oscillators
- Essential for starting and maintaining oscillations in systems like sine wave oscillators and relaxation oscillators.
- It ensures that the output signal is consistently reinforced, leading to sustained oscillations.
- If the feedback is strong enough to overcome any losses in the system, the oscillator will stabilize at a particular frequency.
Comparison with Negative Feedback
- Negative feedback, on the other hand, has the opposite effect. It occurs when the feedback signal is out of phase with the oscillation waveform.
- This type of feedback tends to reduce the amplitude of oscillations, which can stabilize the system but prevent sustained oscillation.
Conclusion
In summary, when the phase of feedback matches that of the oscillation waveform, the feedback is classified as positive. This positive feedback is essential for the onset and maintenance of oscillations in many electronic applications. Understanding the distinction between positive and negative feedback is fundamental for designing effective oscillators in electrical engineering.
In oscillators, feedback plays a crucial role in determining the stability and behavior of the system. The type of feedback can significantly influence whether the oscillator sustains oscillations or not.
Positive Feedback Explained
- Positive feedback occurs when the phase of the feedback signal aligns with the phase of the oscillation waveform.
- This alignment reinforces the oscillations, causing them to grow in amplitude.
- In simple terms, as the output increases, the feedback also increases, which leads to a continuous cycle of amplification.
Role of Positive Feedback in Oscillators
- Essential for starting and maintaining oscillations in systems like sine wave oscillators and relaxation oscillators.
- It ensures that the output signal is consistently reinforced, leading to sustained oscillations.
- If the feedback is strong enough to overcome any losses in the system, the oscillator will stabilize at a particular frequency.
Comparison with Negative Feedback
- Negative feedback, on the other hand, has the opposite effect. It occurs when the feedback signal is out of phase with the oscillation waveform.
- This type of feedback tends to reduce the amplitude of oscillations, which can stabilize the system but prevent sustained oscillation.
Conclusion
In summary, when the phase of feedback matches that of the oscillation waveform, the feedback is classified as positive. This positive feedback is essential for the onset and maintenance of oscillations in many electronic applications. Understanding the distinction between positive and negative feedback is fundamental for designing effective oscillators in electrical engineering.
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In an oscillator if phase of feedback is same as that of oscillation w...
In an oscillator if phase of feedback is same as that of oscillation waveform then feedback is called positive feedback.
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