# gain

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## gain

Electronics the ratio of the output signal of an amplifier to the input signal, usually measured in decibels

## gain

1. A measure of the amplification of an electronic device. If the power input to the device is P 1 and the power output is P 2, the gain expressed in decibels is given by
G = 10 log10 (P 2 /P 1 )

Gains measured in this way can be added when amplifying stages are connected in series.

2. A measure of the directional advantage of using one radio antenna as compared with another. It is usual to express the gain, G , of a particular antenna over an isotropic radiator. For a lossless antenna it is given by
G = 4πA e2
where A e is the effective area (see array) and λ is the wavelength; the gain is equal to the directivity in this case. Sometimes the comparison is with a dipole, which itself has a gain over an isotropic radiator of 1.5 (equivalent to 1.7 decibels, or dBi).

## gain

[gān]
(electronics)
The increase in signal power that is produced by an amplifier; usually given as the ratio of output to input voltage, current, or power, expressed in decibels. Also known as transmission gain.
(electromagnetism)
(engineering)
A cavity in a piece of wood prepared by notching or mortising so that a hinge or other hardware or another piece of wood can be placed on the cavity.

## Gain

An increase in signal power or voltage produced by an amplifier in transmitting a signal from one point to another. The amount of gain is usually expressed in decibels above a reference level. See Amplifier

Antenna gain is a measure of the effectiveness of a directional antenna as compared to a nondirectional antenna. See Antenna (electromagnetism)

## gain

gain joint
In carpentry, a groove or notch in one piece into which another piece is fitted.

## gain

i. The amplification obtained in a radio circuit or a component of the circuit. It is measured as a direct ratio or logarithmically. In radar, there are two general usages of the term: (a) antenna gain, or a gain factor, is the ratio of the power transmitted along the beam axis to that of an isotropic radiator transmitting the same total power; and (b) receiver gain, or video gain, measures how much a receiver amplifies an incoming signal.
ii. A general term for the increase in signal power after transmission from one point to another. Gain is usually expressed in decibels and is widely used to denote transducer gain.

## gain

The amount of increase that an amplifier provides on the output side of the circuit.
References in classic literature ?
You are gaining flesh and color, your appetite is better, I feel really much easier about you.
While we were on the highroad, Blantyre had given me my head; but now, with a light hand and a practiced eye, he guided me over the ground in such a masterly manner that my pace was scarcely slackened, and we were decidedly gaining on them.
So he had recourse to the usual means of gaining time for such cases made and provided; he said "ahem," and coughed several times, took out his pocket-handkerchief, and began to wipe his glasses.
And they kept it up while she was gaining her ambush and getting her glimpse over the declivity; and also while I was creeping to her side on my knees.
I stood there some time enjoying the trip, but at last it occurred to me that we did not seem to be gaining any on the scenery.
And the next time I was heading away to the left of it -- and not gaining on it much either, for I was flying around, this way and that and t'other, but it was going straight ahead all the time.
He trotted along awhile; then slackened his pace, fearing he was gaining too fast; moved on a piece, then stopped altogether; listened; no sound; none, save that he seemed to hear the beating of his own heart.

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