An amplifier is nothing but an oscillator with-

Options

A. positive feedback
B. high gain
C. no feed back
D. negative feed back

Answer

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- An **amplifier** is a device that increases the power of a signal.
- An **oscillator** is a device that generates a repetitive signal, typically in the form of a sine wave or square wave.

2. **Identifying the Relationship:**
- The question states that an amplifier can be viewed as an oscillator with a specific modification. This modification is known as **positive feedback**.

3. **Defining Positive Feedback:**
- In electronics, **positive feedback** occurs when a portion of the output signal is fed back to the input in phase with the input signal. This means that the feedback reinforces the input signal, leading to an increase in the output.

4. **Function of an Oscillator:**
- An oscillator converts **DC (Direct Current)** into **AC (Alternating Current)**. This is done by creating a pulsating output that alternates in polarity.

5. **Function of an Amplifier:**
- An amplifier takes the output signal and feeds it back to the input. This feedback is positive, meaning it enhances the input signal, allowing the amplifier to increase the overall power of the signal.

6. **Conclusion:**
- Therefore, we conclude that an amplifier is essentially an oscillator that incorporates positive feedback to enhance its output.

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

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