Adaptive Predistortion Using a ΔΣ Modulator for Automatic Inversion of Power Amplifier Nonlinearity


This brief demonstrates a new adaptive digital predistortion architecture particularly suited to mobile handset applications. The central idea is to build a lookup table (LUT) that directly captures the static compressive nonlinearity of the power amplifier (PA) and then insert this LUT into the feedback path of a ΔΣ modulator. The oversampled ΔΣ modulator… (More)


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