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Using negative feedback for improvements, which statement is false
1. Increased bandwidth
2. Increased noise
3. Decreased distortion
4. High input impedance but lower output impedance

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Correct Answer - Option 2 : Increased noise

Effect of negative Feedback:

  • Negative feedback in a closed-loop reduces gain improves the bandwidth and disturbance rejection. Also, it reduces the sensitivity to parameter variation.

  • Negative feedback in a control system reduces the overall gain.
  • It reduces the sensitivity of output to input variation, distortion, and noise reduction. (Option (2) is False).
  • It improves bandwidth and input and output impedances (reducing impedance and increasing bandwidth which are desired in most cases)

Negative feedback:

The transfer function of the closed-loop transfer function, with negative feedback, is given by:

\(\frac{{G\left( s \right)H\left( s \right)}}{{1 + G\left( s \right)H\left( s \right)}}\)

The overall gain of the transfer function decreases with negative feedback.

Positive feedback:

In an open-loop system, we do not have any feedback path but in a closed-loop system, we have a feedback path.

The transfer function of the closed-loop transfer function, with positive feedback, is given by:

\(\frac{{G\left( s \right)H\left( s \right)}}{{1 - G\left( s \right)H\left( s \right)}}\)

The overall gain of the transfer function increases with positive feedback.

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