Except for PAE, the general efficiency is output power/DC power
We can see the output power is P1dB output power.
Sometimes, the spec defines the efficiency at certain power level,
but the power is over P1dB and into nonlinear region.
My quesiton is which definition is right? or, which we often used in indurstry?
It would be more appreciated if you could get the plot of PA effieciency with respect to varying input power hence the corresponding efficiency to the output power could be easily obtained. Hope this helps