1dB compression point "reprint"

      1 db compressed output power ( p1db ): the amplifier has a linear dynamic range, in which the output power of the amplifier increases linearly with the input power. As the input power continues to increase, the amplifier enters a non-linear region, its output power no longer increases linearly with the input power, that is, its output power is lower than the expected value of the small signal gain. The gain is usually lowered to a lower than the linear gain 1db 1db p1db said. Typically, when power exceeds p1db p1db 3-4db .

P Output + 1 -linear gain value = P input , meaning first you need to know the relationship value when the input and output are linear.

Figure 1

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1dB compression point "reprint"