Types of Feedback Amplifiers
Feedback amplifiers can be categorized into two main types based on the type of feedback they use :
- Positive feedback Amplifiers
- Negative feedback Amplifiers
Negative Feedback
Given Below is the Block Diagram of the Negative Feedback Amplifier
- Sending a portion of the output signal back to the input with an inverted phase is known as negative feedback in a feedback amplifier.
- Feedback of this sort is frequently applied to stabilize amplifiers, lower distortion, and enhance performance in general. It aids in keeping the input signal amplified precisely and under control.
Positive Feedback
Given Below is the Block Diagram of the Positive Feedback System
- In Positive Feedback, a portion of the output signal is sent back to the input with the same phase in positive feedback.
- Applications like oscillators and signal regeneration may benefit from this kind of feedback, which raises the amplifier’s gain. It does, Yet, they tend to amplify even minor changes in the input signal, requiring careful monitoring to prevent instability.
Unity feedback system
In a feedback amplifier system, a unity feedback occurs when the input signal receives the output feedback at a gain of 1.
According to the definition , [Tex]gain (β) = 1 [/Tex]
Therefore, for positive feedback system :
[Tex]\frac{Vo}{Vs}=\frac{A}{1+A} [/Tex]
And for negative feedback system:
[Tex]\frac{Vo}{Vs}=\frac{A}{1-A} [/Tex]
Feedback Amplifiers
A Feedback amplifier is a type of electronic Circuit Where the output of the Signal is fed back to the input. This feedback loop allows the Amplifier to adjust its performance according to the output received which helps to improve the characteristics of the signal. Feedback Amplifiers are used in various electronic circuits such as Operational amplifiers, audio amplifiers, and various other electronic circuits.
In this Article, We will be going through Feedback Amplifiers, We will start our Article with an introduction of the Feedback Amplifier, then we will go through its types and Topologies, At last we will conclude our Article with its Advantages, Disadvantages and Some FAQs.
Table of Content
- Feedback Amplifier
- Types
- Topologies
- Advantages
- Disadvantages
- Applications
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