Topic: Analog Circuits
Oscillator requires
- A. No feedback
- B. Negative feedback
- C. Positive feedback
- D. Either positive or negative feedback
Answer: C. Positive feedback
Explanation: An oscillator requires positive feedback to satisfy the Barkhausen criterion, ensuring the loop gain is unity and the phase shift is zero (or an integer multiple of $360^\circ$) to sustain continuous oscillations.