loop gain
1
9.1
- noun
- Specialized
:
ganancia de lazo
- The loop gain of the feedback amplifier determines how much output is fed back to the input.
Examples
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One circuit parameter of great importance is the (closed) feedback loop gain inside any amplifier, which must be held at less than unity under all circumstances to avoid runaway positive feedback (g < 1).
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To ensure stability, the design value of the feedback loop gain must be held one or two orders of magnitude below unity: g < 0.1, or preferably < 0.01.
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OK, so the idea here is that large variations in open loop gain lead the much smaller, very much dramatically smaller, right?
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OK, so the thing you observe is that the open loop gain, which is AF.
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As in the electronic circuit, so in the climate object, the values of numerous key components contributing to the loop gain change radically over time.
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The loop gain typically depends on the values of at least half a dozen components, and the actual value of each component may randomly vary.
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A loop gain of 0.1, then, is in practice the upper bound for very long-term climate stability.
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Therefore, the loop gain in the climate object cannot be close to unity, for otherwise random mutation of the feedback-relevant parameters of vital climate components over time would surely by now have driven it to unity.
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In an audio system, the loop gain affects the clarity and stability of the sound output.
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To optimize performance, engineers often adjust the loop gain of the amplifier during testing.
Synonyms
91
6.9
An electronic signal gets extra power from a device like an amplifier
Antonyms
Surface Forms
Morphology
The meaning is directly compositional: 'loop' (a closed signal path) combined with 'gain' (amplification) yields the amount of amplification occurring around the loop. Although it describes a technical feedback measure, the core idea is predictable from the constituents and standard noun-compound formation, so a learner who knows both words can infer the sense.
Etymology
Loop gain comes from the image of a signal going round a loop from the output back to the input, with gain meaning how much that signal is made stronger. If the returned 'feedback' is made too strong, the device can squeal or become unstable, so loop gain tells how much output is fed back and why the system stays stable or not.