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circuits are intentionally designed to actively change the overall gain in response to the level of the input, resulting in a transfer function that may vary over time. Gain compression on the other hand is a consequence of analog amplifier circuit non-linearities that are generally undesired.
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Power transfer curve for an ideal amplifier (green) with a linear gain of 3 and a real amplifier (red) whose gain gets more compressed as the input increases. At 2 Watts input, the ideal amplifier outputs 6 Watts while the real amplifier outputs ~5 Watts (a gain compression of
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gain of the amplifier, such that an increase in input will not be matched by a proportional increase in output. Gain compression is the difference between the ideal linear power transfer curve and the real circuit's power transfer curve.
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range of the device, the effective gain is reduced, altering the shape of the waveform. The effect is also present in transistor circuits. The extent of the effect depends on the topology of the amplifier.
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for RF amplifiers list gain compression rather than distortion figures because it's easier to measure and is more important than distortion figures in nonlinear RF amplifiers.
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This article is about reduction in an amplifier's gain caused by circuit imperfections. For a process that intentionally reduces the dynamic range of audio signals, see
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is a more general term that typically refers to intentional compression, and may be done in the digital realm or analog realm.
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Nonlinearity may be caused by heat due to power dissipation. Also, a transistor's operating point may move with temperature.
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A tube radio or tube amplifier will increase in volume to a point, and then as the input signal extends beyond the
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results from nonlinear transfer curves. And once an amplifier's maximum amplitude is reached, signals will be
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receiver, should improve the transmission range. It works, but the receiver may also pick up a couple of
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circuit characteristics. The output of large amplitude inputs will be less than expected than using the
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circuits, due to topology differences, possibly causing the differences in audio performance called "
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more like gain compression simply because the harmonics are filtered out after amplification. Many
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are particularly susceptible to this phenomenon when overloaded by a strong unwanted signal.
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compression of the output power (OP), corresponding to a gain ratio of 10 = 79.4%.
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Nonlinear
Circuit Simulation and Modeling: Fundamentals for Microwave Design
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Gain compression in RF amplifiers is similar to soft clipping. However, in
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Gain compression is relevant in any system with a wide
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Distinction with intentional dynamic range compression
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of at least 10 GHz is needed. Observing with a
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0.79 dB). Its OP1dB is just above 2 Watts.
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159:caused by
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440:See also
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179:Overview
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424:Limiter
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