Question

Which Feedback is Used in Oscillator?

Answer 1

Hint:The use of positive feedback helps produce oscillators. The condition for positive feedback is that a portion of the output is combined in phase with the input. An oscillator is a circuit that makes a continuous, repeated, alternating waveform without the input. Oscillators convert unidirectional current flow from a DC source into an alternating waveform of the desired frequency, as its circuit components decide.

Complete step-by-step solution:
The feedback that is utilized in an oscillator is positive. The oscillator, which acts as an amplifier, uses positive feedback to produce an output frequency. Here the oscillator is self-driven as the signal is regenerative. No input is used. Positive feedback is utilized mainly because it performs Barkhausen’s Criteria in order to make sustained oscillations. Positive feedback is favoured in oscillators as it provides positive gain to the system; the, i.e., system is likely to Saturation Value depending on the Source Voltage provided.
The oscillators are the amplifier circuits given with positive or regenerative feedback wherein a portion of the output signal is supplied back to the data. The utilization of positive feedback helps generate oscillators. The situation for positive feedback is that a part of the output is joined in phase with the input.
Positive feedback is utilized to have more gain. For the oscillator, the gain should be at maximum to have sustained oscillations. On the other hand, negative feedback decreases the gain but gives stability to the system. Usually, negative feedback is used in amplifiers.

Note:Oscillations are only likely if there is a huge gain of an amplifier, and it is probable with positive feedback only while negative feedback is implemented to regulate the gain or amplification of the amplifier. Both feedback features are reversible so that an amplifier can be used as an efficient operation amplifier, not an oscillator, including negative feedback.