What is gain?

  • (noun): The advantageous quality of being beneficial.
    Synonyms: profit
    See also — Additional definitions below


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.

Read more about Gain.

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 ... topology and an operational amplifier configured to provide non-unity-gain, it can be analyzed using similar methods as with the generic Sallen–Key topology ... divider in the negative feedback loop controls the gain ...
Horn Antenna - Gain
... 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 gain is where A ...
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 ...

More definitions of "gain":

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

Famous quotes containing the word gain:

    Beauty for some provides escape,
    Who gain a happiness in eyeing
    The gorgeous buttocks of the ape
    Or Autumn sunsets exquisitely dying.
    Aldous Huxley (1894–1963)

    ...if you are to gain any great amount of good from the world, you must attain a passive condition of mind. ...it is never to be forgotten that it is the rest of the world and not you that holds the great share of the world’s wealth, and that you must allow yourself to be acted upon by the world, if you would become a sharer in the gain of all the ages to your own infinite advantage.
    Anna C. Brackett (1836–1911)

    Those who can lose shall gain; those who wish for gain shall lose.
    Chinese proverb.