Negative feedback amplifier has effects for reducing distortion, as well as noise, form sensitivity to external changes and improving system bandwidth and input and output impedances. Here this post gives some advantages and disadvantages of negative feedback amplifier over the positive feedback amplifier to better understand this topic.
Advantages of a negative feedback amplifier:
- The negative feedback reduces the size
- It has highly stabilized gain
- It has fewer harmonics distortion
- It has less phase distortion
- It has higher fidelity
- More linear operation
- It has less frequency distortion
- Input-output impedances can be modified as desired
- It can increase or decrease output impedances
- It can control the step response of an amplifier
- It can control the step response of an amplifier
- It has less amplitude distortion
Disadvantages of a negative feedback amplifier:
- Its reduction in gain
- It increases output resistance in the case of shunt and current series feedback amplifiers
This article also gives some advantages and disadvantages of a negative feedback amplifier over a positive feedback amplifier:
Advantages of a negative feedback amplifier over a positive feedback amplifier:
- The operating point is stabilized
- Output resistance decreases for certain configurations
- Input resistance increases for certain configuration
- The negative feedback is employed in various application such as an electronic amplifier, regulated power supplies, wideband amplifier, etc
Disadvantages of negative feedback over the positive feedback amplifier:
- It reduced gain
- Reduction of input resistance for current shunt amplifiers and voltage shunt type
- Increases in output resistance in case of current series and current shunt feedback amplifiers
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