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Consider the following I.  Oscillator II. Emitter follower III. Cascaded amplifier IV. Power amplifier Which of the following use feedback amplifiers?

Consider the following I.  Oscillator II. Emitter follower III. Cascaded amplifier IV. Power amplifier Which of the following use feedback amplifiers? Correct Answer I and II

Oscillator:

With the use of positive feedback or regenerative feedback, the oscillations will take place in a circuit and the circuit acts as an oscillator.

Emitter follower:

It has negative current feedback as shown in the figure below.

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