the Advantages and disadvantages of negative feedback

Negative feedback is a technique used at amplifier circuits, main purpose of negative feedback on the amplifier is to increase the gain of the amplifier network.

what is Amplifier

what is Amplifier
what is Amplifier

An amplifier is a circuit used to increase the strength of the weak signal, amplification is an important process at wireless communication because wireless propagation of signal causes many losses, these signal losses are been cover using amplifier circuits.

Negative feedback at the amplifier

Negative feedback is a network used with an amplifier circuit to support the amplification process negative feedback is a network that connects from the output of the amplifier to input.

The process that happens on the amplifier due to negative feedback is just feeding back a portion of the signal from output to input.

In this article, we explain the after-effects of negative feedback on the amplifier, which include the advantages and disadvantages of a negative feedback network.

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Advantages & disadvantages of negative feedback

Negative feedback in amplifiers has more advantages than disadvantages, it is a common technique used at all amplifier networks.

Advantages of negative feedback   

  • Less frequency distortion
  • High stabilized gain
  • They can control the step response of the amplifier
  • Less harmonic distortion
  • Less phase distortion
  • Reduction of noise
  • They can modify the output and input impedance of the amplifier
  • High fidelity
  • More linear operation
  • Reduce non-linear distortion
  • Increase circuit stability
  • Increases the bandwidth
  • Used at amplifiers, regulated power supplies, and wideband amplifiers.

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Explain the main advantages of negative feedback

Noise

Noise is the vital term at amplification because a good signal is considered a signal without or less noise.

The negative feedback offers less noise, the output to input injection of the signal is out of phase to input, this process reduces noise.

Frequency distortion

Frequency distortion is disturbances that happen at a particular frequency range.

Negative feedback had less frequency distortion, the amplifier is a circuit that handles a wide range of frequencies, so naturally, less frequency distortion is needed to make a better audio signal.

Stabilized gain

Gain of the amplifier is the main purpose of an amplification network, the strength of an amplifier is measured with its gain.

The negative feedback network stabilized the gain of the amplifier, this is happen by feeding back the out-of-phase signal to the input.

Step response

The step response is the ability of the amplifier to adapt with response to change in input voltage.

The negative feedback had a controlled step response, it will ensure a proper response at the change in input voltage.

Harmonic distortion

 Harmonic distortion is a disturbance that happens on the waveform, which results in variations at a voltage or current that causes problems in the power system.

The negative feedback causes less harmonic distortion, this may be because the feeding back of output to input reduces the total harmonic distortion.  

Impedance

The negative feedback network is capable of modifying the impedance of the amplifier circuit, the input and output impedance of the amplifier network can be varied with the negative feedback network.

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Disadvantages of negative feedback

  • Reduction of gain
  • It increases output resistance in the case of current shunt and current series.

Explain the main disadvantages of negative feedback

Reduction of gain

The negative feedback network reduces the overall gain of the amplifier, the injection of the output signal to input will reduce the overall gain and maintain a stable gain.

Applications of the negative feedback network

The negative feedback is an important process to do at a circuit like an amplifier and voltage regulator circuits.

The theory behind negative feedback is simple, a portion of output will feedback to the input of the amplifier.

At the amplifier network, the audio signal has many advantages using the feedback network, because they support the amplifier for strengthening the audio signal.

But at the voltage regulator circuit, the stabilization of voltage will be done by maintaining a specific gain at the circuit.

Other than this, negative feedback networks have many advantages and applications on many electronic circuits.

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