Introduction to Feedback amplifier

1. 1.Introduction to Feedback
2. 3.Advantages/Disadvantages of Negative Feedback
3. 4.Basic Feedback Concept
4. 5.Classification of Amplifiers
5. 6.Series – Shunt Configuration
6. 7.Shunt – Series Configuration
7. 8.Series - Series Configuration      
   

¨Feedback is used in virtually all amplifier system.

¨Invented in 1928 by Harold Black – engineer in Western Electric Company

¤methods to stabilise the gain of amplifier for use in telephone repeaters.

¨In feedback system, a signal that is proportional to the output is fed back to the input and combined with the input signal to produce a desired system response.

¨However, unintentional and undesired system response may be produced.

Feedback Amplifier

¨ Feedback is a technique where a proportion of the output of a system (amplifier) is fed back and recombined with input

¨ There are 2 types of feedback amplifier:

¤Positive feedback

¤Negative feedback

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