Topic: Analog Circuits
Negative feedback in amplifiers
- A. improves the signal to noise ratio at the input
- B. improves the signal to noise ratio at the output
- C. Doesn't affect the Signal to Noise ratio at the output
- D. All of these
Answer: B. improves the signal to noise ratio at the output
Explanation: Negative feedback reduces the system noise (introduced within the amplifier stages) in the closed-loop system by a factor of $(1+A\beta)$, thus generally improving the signal-to-noise ratio at the output of the amplifier.