Question

What are the advantages of the negative feedback?

Answer 1

The process by which fraction of the output signal is again given back to input is known as feedback. This fraction of output signal can be either a voltage or a current. When both the signals are in opposite phases then the feedback is known as negative feedback. This feedback subtracted from the input signal gives many advantages in the design and stabilization of control systems.

Complete step by step answer:
When some part of the output signal is fed back to the input then that signal is known as a feedback signal. When the feedback signal and input signal are in the same phase i.e. both the signals have same polarities, then that feedback is called as Positive feedback. When the feedback signal and input signal are out of phase i.e. both the signals have different polarities, then that feedback is called as Negative feedback. Its circuit is given below:

Negative feedback has various advantages. It has following advantages:
1. It helps to increase or decrease the output impedances.
2. Its input and output impedance can be modified as per desire.
3. It has less phase distortion and amplitude distortion.
4. It also has less harmonic distortion.
5. Negative feedback can be used to reduce noise.
6. It has improved frequency response which leads to less frequency distortion.
7. It shows more linearity in operations.
8. It has better stabilized voltage gain.

Note:
Negative feedback is also known as degenerative feedback, self-correcting feedback and balancing feedback. So, students must also remember these terms related to negative feedback. It is the most common form of feedback control configuration used in processor, micro-computer and amplification systems.