An oscillator is nothing but an amplifier with

Options

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

Answer

To solve the question "An oscillator is nothing but an amplifier with:", we need to analyze the options provided and understand the concept of oscillators and amplifiers.

### Step-by-Step Solution:

1. **Understanding the Components**:
- An **oscillator** is a device that generates a periodic waveform, typically a sine wave or square wave.
- An **amplifier** is a device that increases the power of a signal.

2. **Feedback Mechanism**:
- In an oscillator, feedback is crucial. Feedback refers to the process where a portion of the output signal is fed back to the input.
- There are two types of feedback: **positive feedback** and **negative feedback**.

3. **Role of Feedback in Oscillators**:
- For an oscillator to function, it requires **positive feedback**. This means that the feedback signal reinforces the input signal, allowing the oscillator to sustain oscillations.
- If negative feedback were used, it would dampen the signal and prevent sustained oscillations.

4. **Large Gain**:
- While oscillators often require a large gain to overcome losses in the system, the defining characteristic that distinguishes an oscillator from a simple amplifier is the type of feedback used.

5. **Conclusion**:
- Based on the above analysis, we conclude that an oscillator is essentially an amplifier that uses **positive feedback** to produce continuous oscillations.

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