Definitions for loop gain
loop gain

Princeton's WordNetRate this definition:5.0 / 3 votes

1. loop gainnoun

   (telecommunication) the gain of a feedback amplifier or system as a function of how much output is fed back to the input

   "if the loop gain is too great the system may go into oscillation"

WikipediaRate this definition:0.0 / 0 votes

1. Loop gain

   In electronics and control system theory, loop gain is the sum of the gain, expressed as a ratio or in decibels, around a feedback loop. Feedback loops are widely used in electronics in amplifiers and oscillators, and more generally in both electronic and nonelectronic industrial control systems to control industrial plant and equipment. The concept is also used in biology. In a feedback loop, the output of a device, process or plant is sampled and applied to alter the input, to better control the output. The loop gain, along with the related concept of loop phase shift, determines the behavior of the device, and particularly whether the output is stable, or unstable, which can result in oscillation. The importance of loop gain as a parameter for characterizing electronic feedback amplifiers was first recognized by Heinrich Barkhausen in 1921, and was developed further by Hendrik Wade Bode and Harry Nyquist at Bell Labs in the 1930s. A block diagram of an electronic amplifier with negative feedback is shown at right. The input signal is applied to the amplifier with open-loop gain A and amplified. The output of the amplifier is applied to a feedback network with gain β, and subtracted from the input to the amplifier. The loop gain is calculated by imagining the feedback loop is broken at some point, and calculating the net gain if a signal is applied. In the diagram shown, the loop gain is the product of the gains of the amplifier and the feedback network, −Aβ. The minus sign is because the feedback signal is subtracted from the input. The gains A and β, and therefore the loop gain, generally vary with the frequency of the input signal, and so are usually expressed as functions of the angular frequency ω in radians per second. It is often displayed as a graph with the horizontal axis frequency ω and the vertical axis gain. In amplifiers, the loop gain is the difference between the open-loop gain curve and the closed-loop gain curve (actually, the 1/β curve) on a dB scale.

ChatGPTRate this definition:0.0 / 0 votes

1. loop gain

   Loop gain refers to the gain, or amplification, of a feedback system in a loop, often used in electronic circuits such as oscillators or amplifiers. It is the product of the forward gain and the feedback gain in a system. Ideally, the system should be stable and the loop gain should be equal to or less than 1 for the system to function properly without oscillations. In control system theory, the loop gain significantly affects the stability and performance of the system.

WikidataRate this definition:4.0 / 3 votes

1. Loop gain

   Loop gain is a function of how much output is fed back to the input; "if the loop gain is too great the system may go into oscillation" or it is a measure of the gain of a system controlled by feedback loops. As such, the concept of loop gain is useful in a variety of disciplines. Traditionally, most of those have been in the fields of electronics, telecommunications, or control systems. It is also useful in biology. In amplifiers with feedback, loop gain is the product of the gain in the feedback loop and the feedback factor in that loop. In telecommunications, loop gain can be either of: ⁕The total usable power gain of a carrier terminal or two-wire repeater. The maximum usable gain is determined by, and may not exceed, the losses in the closed path. ⁕The sum of the gains, expressed in dB, acting on a signal passing around a closed path, i.e., a loop. This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".

Matched Categories

1. • Amplification
   • Telecommunication

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Numerology

1. Chaldean Numerology

   The numerical value of loop gain in Chaldean Numerology is: 8

2. Pythagorean Numerology

   The numerical value of loop gain in Pythagorean Numerology is: 8

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=loop gain
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Loop_Gain
3. ^ ChatGPT
   https://chat.openai.com
4. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=loop gain