Question

On what criteria does the feedback amplifier are classified?

(a) Signal fed back to input

(b) Signal applied to input

(c) Signal fed back to output

(d) None of the mentioned

This question was addressed to me in my homework.

Enquiry is from Block Diagram Representation of Feedback Configurations in chapter Operational Amplifier Characteristics of Linear Integrated Circuits

Answer 1

The correct answer is (a) Signal fed back to input.

Feedback amplifiers are classified based on the signal fed back to the input of the amplifier. The feedback can either be positive (regenerative) or negative (degenerative). The feedback can also be classified according to its effect on the amplifier's behavior:

1. Voltage Feedback: The signal is fed back in terms of voltage.
2. Current Feedback: The signal is fed back in terms of current.

This classification helps in understanding how the amplifier’s performance will be altered, affecting characteristics like gain, bandwidth, stability, and impedance.