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A 2-stage 1.7-GHz Doherty power amplifier (PA) with an adaptive bias (ADB) circuit was designed for small-cell base station applications. An uneven power cell size ratio was used to provide a large back-off efficiency for high peak-to-average power ratio (PAPR) signals. To simplify the power divider and inter-stage matching network, a lumped Lange-type quadrature coupler was used. The leakage signal...