Which type of feedback is used in oscillators?

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Negative

Both

None

Positive

answer is A.

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Detailed Solution

A positive form of feedback is used in oscillators. Positive feedback is used by the oscillator, an amplifier, to produce an output frequency. As the signal is regenerative in this case, the oscillator is self-driven. Nothing is entered.
The fundamental reason for using positive feedback is that it fulfils Barkhausen's Criteria to produce sustained oscillations.
In oscillators, positive feedback is preferred because it gives the system a positive gain, which makes the system more likely to reach saturation depending on the source voltage applied.
The amplifier circuits known as oscillators are positive or regenerative feedback amplifiers that supply some of the output signal back to the data.
Positive feedback is employed to produce oscillators. A portion of the output must be in phase with the input in order for there to be positive feedback.
Positive criticism is used to increase gain. To achieve prolonged oscillations, the oscillator's gain needs to be set to maximum. Negative feedback, on the other hand, stabilises the system while reducing gain. In amplifiers, negative feedback is frequently employed.

Hence the correct answer is positive.

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