A transfer function is a graph that map values if input to output. The steepness of the function graph “amplify” the input and becomes the output. The transfer function in real world is not linear. The toe and shoulder of the graph are termed as cut off and distortion respectively. The steepness of the curve in the middle section is called gain. The design of the mechanism is to make sure the input stay in the stable (linear) middle portion of the graph.
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