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The envelope-tracking front-end module (ETFEM) consisting of an envelope-tracking supply modulator (ETSM), a dual-power-mode power amplifier (PA), and a single-pole-double-throw (SPDT) switch is proposed for the Long-Term Evolution-Advanced (LTE-A) intraband carrier aggregation (CA) signal. The linear stage of ETSM is implemented by introducing the dual-path crossover current-reuse mechanism to obtain...
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