Closed Loop Gain
ClosedLoop.png

Before we discuss the closed-loop gain, let’s review a concept: transfer function. A transfer function is a mathematical representation of the relation between the input and output of a system.

The transfer function of a closed-loop configuration is G=A/(1+βA), which is the closed-loop gain. Where A is open loop gain, β is feedback factor, βA is loop gain. It is easy to see the difference between closed loop gain and open loop gain.

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