An oscillator is nothing but an amplifier with

Options

A. larger gain
B. positive feedback
C. no feedback
D. negative feedback

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept of an Oscillator:**
An oscillator is a circuit that generates a periodic output signal, typically a sine wave or square wave, without requiring an external input signal.

2. **Role of the Amplifier:**
An oscillator can be viewed as a special type of amplifier. An amplifier typically takes an input signal and increases its amplitude. In the case of an oscillator, the amplifier is used to create a continuous output signal.

3. **Feedback Mechanism:**
The key to an oscillator's operation is the feedback mechanism. The oscillator uses positive feedback, which means that a portion of the output signal is fed back into the input of the amplifier in phase with the original signal. This reinforcement allows the oscillator to sustain oscillations.

4. **Desired Frequency:**
The frequency of the oscillation is determined by the components in the feedback network (like resistors, capacitors, and inductors). These components set the timing characteristics of the oscillator, allowing it to produce an output at a desired frequency.

5. **Final Conclusion:**
Therefore, we can conclude that an oscillator is essentially an amplifier with positive feedback that produces an output at a desired frequency without any external input voltage.

**Final Answer:**
An oscillator is nothing but an amplifier with **positive feedback**.

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