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Power-added efficiency is a metric for rating the efficiency of a power amplifier that takes into account the effect of the gain of the amplifier. It is calculated as:
P A E = 100 × P O U T R F − P I N R F P D C T O T A L {\displaystyle \mathrm {PAE} =100\times {\frac {P_{OUT}^{RF}-P_{IN}^{RF}}{P_{DC}^{TOTAL}}}}
It differs from most power efficiency descriptions calculated as:
η = 100 × P O U T R F / P I N D C {\displaystyle \eta =100\times {P_{OUT}^{RF}}/{P_{IN}^{DC}}}