aaron_do
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Hi,
are you sure you ran your simulation correctly? I have a hard time visualizing how you could have extrapolated an IP1dB of -51 dBm when the reference gain is at an input of -40 dBm (are you sure the result is not -21 dBm?).
You should extrapolate from a point where you know the gain is linear. So even if you change the extrapolation point by a few dB, it shouldn't change the IP1dB result. Anyway P1dB is just a reference point and is very subjective. It doesn't necessarily signify that anything significant has happened at that point. For instance, just because the IP1dB is -10 dBm, it doesn't mean that the system can't run beyond -10 dBm, and it doesn't even mean that the system can work up to -10 dBm. Furthermore, just because amplifier A has an IP1dB of -10 dBm and amplifier B has an IP1dB of -8 dBm, it doesn't mean that amplifier B will work up to a higher input power.
regards, Aaron
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