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Understanding gain vs Pout plot

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prateek3790

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Gain is Pout/Pin. So it can tell about input power. 1dB compression point is coming from the gain vs. Pin or Pout curves. Where the gain drops, the distortion increases and harmonics appear in the spectrum. I think this is the reason why it is useful.
 

frankrose said:
Gain is Pout/Pin. So it can tell about input power. 1dB compression point is coming from the gain vs. Pin or Pout curves. Where the gain drops, the distortion increases and harmonics appear in the spectrum. I think this is the reason why it is useful.
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thanks for the reply, one reason is to tell the amplifier class as well. https://k9la.us/Characterizing_an_RF_Power_Amplifier_with_Pin_and_Pout_Data.pdf
However what i am struggling is to understand is the behaviour for a particular power level.

suppose i am giving pin = -8dbm, now how to tell the gain change between high and low power mode, do i need to do pin = pout - gain just to see for same pin how much output power as changed.
 

Gain v.s. Pout is for estimation of deviation from linear operation, e.g. BackOff.

Pin has not much meaning in power amplifier, since we can measure only Pout.
 
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