Question

Define feedback, explain deferent types of feedback and the effect of negative feedback in amplifier parameters i.e. Voltage gain, Zin, Zout and Bandwidth.​

Answer 1

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The term 'feedback' is used to describe the helpful information or criticism about prior action or behavior from an individual, communicated to another individual (or a group) who can use that information to adjust and improve current and future actions and behaviors.

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Answer 2

Explanation:

Feedback is an event that occurs when the output of a system is used as input back into the system as part of a chain of cause and effect. This alters variables in the system, therefore resulting in different output and consequently different feedback as well, which can either be good or bad. In the case of a system which requires knowledge of the output in order to improve or deliver on a specific output, then feedback is essential and good. But for a system that does not require feedback, such as an audio system, then feedback is often bad. Take for example a microphone and speaker system, when the sound from the speakers (output) is picked up by the microphone (input) it creates a negative feedback that produces a very high pitched sound.