
gain ground
[From Middle English gayne, booty (from Old French gaigne, gain, gain , from gaaignier, to gain , of Germanic origin) and Middle English gein, advantage (from Old Norse gegn, ready, and and from Old French gain, gain).]

[Origin unknown.]
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 also Amplifier.
Antenna gain is a measure of the effectiveness of a directional antenna as compared to a nondirectional antenna. See also Antenna (electromagnetism).
The amount of increase that an amplifier provides on the output side of the circuit.
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verb
noun
In addition to the idiom beginning with gain, also see ill-gotten gains; no pain, no gain; nothing ventured, nothing gained.
Definition: acquire
Antonyms: lose
n
Definition: acquisition, winnings
Antonyms: expenditure, forfeit, forfeiture, loss, waste
v
Definition: acquire, win
Antonyms: exhaust, forfeit, lose, miss, pass, spend, waste
In carpentry, a groove or notch in one piece into which another piece is fitted.
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An increase in the value of an asset or property. A gain is measured as the amount of capital realized from selling a good at a price higher than the original purchase price.
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Increase in voltage, current and/or power. Gain is expressed as a ratio of amplifier output value to the corresponding amplifier input value.
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Quotes:
"It is always sound business to take any obtainable net gain, at any cost and at any risk to the rest of the community."
- Thorstein Veblen
"No gain is so certain as that which proceeds from the economical use of what you already have."
- Latin Proverb
"And gain is gain, however small."
- Robert Browning
"The true way to gain much, is never to desire to gain too much."
- Francis Beaumont

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.
Thus, the term gain on its own is ambiguous. For example, "a gain of five" may imply that either the voltage, current or the power is increased by a factor of five, although most often this will mean a voltage gain of five for audio and general purpose amplifiers, especially operational amplifiers, but a power gain for radio frequency amplifiers, and for directional aerials will refer to a signal power change compared with a simple dipole. Furthermore, the term gain is also applied in systems such as sensors where the input and output have different units; in such cases the gain units must be specified, as in "5 microvolts per photon" for the responsivity of a photosensor. The "gain" of a bipolar transistor normally refers to forward current transfer ratio, either hFE ("Beta", the static ratio of Ic divided by Ib at some operating point), or sometimes hfe (the small-signal current gain, the slope of the graph of Ic against Ib at a point).
In laser physics, gain may refer to the increment of power along the beam propagation in a gain medium, and its dimension is m−1 (inverse meter) or 1/meter.
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Power gain, in decibels (dB), is defined by the 10 log rule as follows:

where Pin and Pout are the input and output powers respectively.
A similar calculation can be done using a natural logarithm instead of a decimal logarithm, and without the factor of 10, resulting in nepers instead of decibels:

When power gain is calculated using voltage instead of power, making the substitution (P=V 2/R), the formula is:

In many cases, the input and output impedances are equal, so the above equation can be simplified to:

and then the 20 log rule:

This simplified formula is used to calculate a voltage gain in decibels, and is equivalent to a power gain only if the impedances at input and output are equal.
In the same way, when power gain is calculated using current instead of power, making the substitution (P = I 2R), the formula is:

In many cases, the input and output impedances are equal, so the above equation can be simplified to:

and then:

This simplified formula is used to calculate a current gain in decibels, and is equivalent to the power gain only if the impedances at input and output are equal.
The "current gain" of a bipolar transistor, hFE or hfe, is normally given as a dimensionless number, the ratio of Ic to Ib (or slope of the Ic-versus-Ib graph, for hfe).
In the cases above, gain will be a dimensionless quantity, as it is the ratio of like units (Decibels are not used as units, but rather as a method of indicating a logarithmic relationship). In the bipolar transistor example it is the ratio of the output current to the input current, both measured in Amperes. In the case of other devices, the gain will have a value in SI units. Such is the case with the operational transconductance amplifier, which has an open-loop gain (transconductance) in Siemens (mhos), because the gain is a ratio of the output current to the input voltage.
Q. An amplifier has an input impedance of 50 ohms and drives a load of 50 ohms. When its input (
) is 1 volt, its output (
) is 10 volts. 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. Power gain is more usually expressed in decibels, thus:

A gain of factor 1 (equivalent to 0 dB) where both input and output are at the same voltage level and impedance is also known as unity gain.
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Dansk (Danish)
1.
v. tr. - få, vinde, nå
v. intr. - tjene, stige, høste
n. - gevinst, fortjeneste, forstærkning
idioms:
2.
n. - indskæring
v. tr. - indskære
Nederlands (Dutch)
bereiken, verwerven, winnen, behalen, overhalen, voorlopen (uurwerk), inhalen (achtervolging), verkrijgen, verdienen, baat, (aan)winst, toename, versterking (sfac- tor), winst
Français (French)
1.
v. tr. - prendre de la vitesse, gagner, atteindre (un endroit)
v. intr. - gagner (en), rapporter (à)
n. - (gén) gain, profit, avantage, augmentation, hausse, (Élec) gain
idioms:
2.
n. - entaille, encoche
v. tr. - encocher, tailler une encoche dans
Deutsch (German)
1.
v. - gewinnen, erreichen, verdienen, vorgehen
n. - Nutzen, Gewinn, Steigerung, (tech.) Verstärkung
idioms:
2.
n. - Fuge, Kerbe, Einschnitt, Zapfenloch
v. - kerben, verzapfen
Ελληνική (Greek)
v. - κερδίζω, αποκτώ, παίρνω, προηγούμαι, κατακτώ, τρέχω, πάω μπροστά (για ρολόι), φθάνω
n. - κέρδος, ωφέλεια, απόκτημα, πλεονέκτημα, αύξηση, προσθήκη
idioms:
Italiano (Italian)
guadagnare, conseguire, ottenere, profitto, guadagno
idioms:
Português (Portuguese)
v. - ganhar, conquistar, avançar
n. - ganho (m), acréscimo (m), aquisição (m)
idioms:
Русский (Russian)
добывать, зарабатывать, выгадывать, достигать, добираться, завоевывать, прибыль, выгода, набирать (в весе и пр.), спешить (о часах), выигрыш, прирост, корысть, усиление (звука и пр.)
idioms:
Español (Spanish)
1.
v. tr. - ganar, alcanzar, conseguir, lograr, obtener, adquirir, embolsar, persuadir, adelantar (reloj)
v. intr. - mejorar, progresar, avanzar, acercarse, adelantar a los competidores, aumentar en valor
n. - beneficio, provecho, ganancia, lucro, utilidad, aumento, triunfo
idioms:
2.
n. - muesca, corte, mella
v. tr. - abrir una muesca en
Svenska (Swedish)
v. - få, vinna, förvärva, göra vinst på, öka, dra ifrån, (om havet) inkräkta på land, vinna inflytande (insteg) hos
n. - vinst (i allm.), fördel, (snöd) vinning, ökning, förstärkning (elektr.)
中文(简体)(Chinese (Simplified))
1. 得到, 使得到, 获得, 赢得, 增加, 增添, 获利, 赚钱, 取得进展, 得益, 得到改善, 获得物
idioms:
2. 获得, 获利, 增加, 获得物, 得到, 使得到, 赢得, 增添
中文(繁體)(Chinese (Traditional))
1.
v. tr. - 得到, 使得到, 獲得, 贏得, 增加, 增添
v. intr. - 獲利, 賺錢, 取得進展, 得益, 得到改善
n. - 獲得, 獲利, 增加, 獲得物
idioms:
2.
n. - 獲得, 獲利, 增加, 獲得物
v. tr. - 得到, 使得到, 獲得, 贏得, 增加, 增添
한국어 (Korean)
1.
v. tr. - 얻다, 달성하다, 설득하다, (무게가) 늘다
v. intr. - 이익을 얻다, ~이 증가하다, (시계가) 빨리 가다
n. - 이익, 증가, 획득
idioms:
2.
n. - 칼자국
v. tr. - ~에 칼자국을 내다
日本語 (Japanese)
v. - 得る, 儲ける, 利益を得る, 進む, 増す, 到達する, 獲得する, たどり着く
n. - 利益, 増加
idioms:
العربيه (Arabic)
(فعل) يكسب (الاسم) كسب, ربح
עברית (Hebrew)
v. tr. - השיג, הגיע ל-, רכש, הרוויח, זכה, צבר, קיבל
v. intr. - עלה (במשקל), מיהר, הדביק בריצה את
n. - רווח, יתרון, תוספת, עליה, שיפור
n. - חור בקרש כדי לתחוב לתוכו קרש המתחבר אליו
v. tr. - הרוויח, עשה חור(ים) בקרש, חיבר באמצעות חור(ים) בקרש
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