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Application of Digital Adaptive Pre-distortion to Mobile Wireless Devices

Low power adaptive pre-distortion (APD) techniques are applied to nonlinear RF power amplifiers for mobile devices. An APD system is demonstrated which reduces spectral regrowth products by 10-20 dB and increases modulation accuracy by 2-6X. The use of APD allows a reduction in 3 G PA supply current by 2X and provides immunity to load mismatches as high as 8:1.