Fundamentals of Power Amplifier Linearization Using Digital Pre-Distortion

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  • Author: Mohamed K. Nezami
Pre-distortion is basically a method by which one first stimulates a non-linear power amplifier (PA) with baseband samples and then observes the result of that stimulus at the PA output. Then , the amplitude-to- amplitude modulation (AM/AM) and amplitude-to-phase modulation (AM/PM) effects of the PA are estimated. These estimat-ed distortions are then removed from the PA by pre-distorting the input stimulus with their inverse equivalents.