Question

An oscillator is nothing but an amplifier with
(A) Positive feedback
(B) Large gain
(C) No feedback
(D) Negative feedback

Answer 1

Hint:The amplifier strengthens the input power and provides the amplified output. The oscillator does not require any input since it functions by the feedback system and is used in producing the oscillating periodic signal that may be of any type of wave.

Complete step by step answer:
The oscillator and the amplifier works in the same way but the amplifier requires input where the oscillator does not require any input, it usually starts when there is any random noise from the components of the circuit or from the surrounding. This noise is the unwanted signal that comes along with the signal voltage. The amplifier does not produce the periodic wave.

When the amplifier connects with positive feedback, it acts as the oscillator. The feedback employed here is positive feedback, this means some amount of the output voltage is given to the input. Hence the circuit continues its process without any input to the oscillator. The positive feedback is also known as regenerative feedback because the system sustains or regenerates itself without any input source. Hence the oscillator is nothing but an amplifier with the positive feedback.

Thus the option (A) is correct.

Note:The main use of the oscillator is to transmit the direct current power supply to the alternating current power supply and used in the power transmission. These are used in the clocks, calculators, computers etc. The negative feedback is opposite to that of the positive feedback, it controls the output and inhibits the process to happen again. Hence this feedback is also known as the balancing feedback.