An amplifier with a voltage gain of 60db uses 1/20th of it's output in the negative feedback cycle
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Feedback in an electrical system, whether negative or positive, is unilateral in nature. That is, its signals travel in just one direction, from the system's output to its input. As a result, the system's loop gain, G, is independent of the load and source impedances.
Explanation- Because feedback indicates a closed-loop system, there must be a summing point. This summation point or junction at the input of a negative feedback system subtracts the feedback signal from the input signal to generate an error signal, which drives the system. If the system has a positive gain, the feedback signal must be subtracted from the input signal to make it negative, as indicated.
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