What is gain?

  • (verb): Obtain.
    Synonyms: derive
    See also — Additional definitions below

Gain

In electronics, gain is a measure of the ability of a circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output. It is usually defined as the mean ratio of the signal output of a system to the signal input of the same system. It may also be defined on a logarithmic scale, in terms of the decimal logarithm of the same ratio ("dB gain"). A gain greater than one (zero dB), that is, amplification, is the defining property of an active component or circuit, while a passive circuit will have a gain of less than one.

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Some articles on gain:

Sallen–Key Topology - Application: Bandpass Filter
... An example of a non-unity-gain bandpass filter implemented with a VCVS filter is shown in Figure 5 ... amplifier configured to provide non-unity-gain, it can be analyzed using similar methods as with the generic Sallen–Key topology ... by The voltage divider in the negative feedback loop controls the gain ...
Gain - Logarithmic Units and Decibels - Example
... What is its voltage and power gain? A ... Voltage gain is simply The units V/V are optional, but make it clear that this figure is a voltage gain and not a power gain ... Using the expression for power, P = V2/R, the power gain is Again, the units W/W are optional ...
Horn Antenna - Gain
... Horns have very little loss, so the directivity of a horn is roughly equal to its gain ... The gain G of a pyramidal horn antenna (the ratio of the radiated power intensity along its beam axis to the intensity of an isotropic antenna with the same input power) is For conical horns, the ...

More definitions of "gain":

  • (noun): The amount by which the revenue of a business exceeds its cost of operating.
  • (noun): A quantity that is added.
    Example: "They recorded the cattle's gain in weight over a period of weeks"
    Synonyms: addition, increase
  • (verb): Increase (one's body weight).
    Synonyms: put on
  • (noun): The amount of increase in signal power or voltage or current expressed as the ratio of output to input.
    Synonyms: amplification
  • (verb): Rise in rate or price.
    Synonyms: advance
  • (noun): The advantageous quality of being beneficial.
    Synonyms: profit
  • (verb): Increase in.
    Example: "Gain momentum"; "gain nerve"
  • (verb): Win something through one's efforts.
    Example: "Gain an understanding of international finance"
    Synonyms: acquire, win

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    William Hazlitt (1778–1830)