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Class E amplifiers were introduced by N.O. Sokal and A. D. Sokal in the 70s [1] and, since then, numerous applications where higher efficiency was one of the key issues have been presented.
This paper highlights the achievement of constant efficiency (power added efficiency, PAE) across wide output power levels for fixed amplitude constant envelope modulation. Power amplifier drain supply is adjusted while having a fixed load impedance network. Input RF drive to the power amplifier has to change according to the output power in order to maintain the PAE across a wide range of power levels...
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