Gain is a measure of the ability of a two-port circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output port.
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Pro Tips
Gain > 0 dB: Amplification (output is greater than input).
Gain < 0 dB: Attenuation (output is less than input).
Gain = 0 dB: No change (Unity Gain).
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Fun Facts
"Cascaded stages have their linear gains multiplied, but their decibel gains are simply added."
"An increase of 10 dB in gain represents a ten-fold increase in power."
