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Small and Large signal Gian

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Hello
I want to know the different states of large signal gain and small signal gain when the input signal is small or large.it is useful to know G(large gain signal) and g(small gain signal) which is the greater and which is smaller when signal is little and large
 
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Gain is usually the same at low levels and at high levels. But a radio amplifier sometimes has compression distortion that reduces its gain at high levels. A very distorted audio amplifier that is clipping also has reduced gain at high levels.
 
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    FvM

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Small signal gain calculations use a fixed value for the gain, independent of the signal level.
Thus the circuit exhibits no distortion between input and output due to signal level.

Large signal gain calculations use the value of gain as it varies with the transistor current level.
This is typically most easily done with a simulator that has models which give the transistor gain as a function of the instantaneous signal level change.
As AG noted, this change in gain generates distortion.
 

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