Power amplification apparatus of portable terminal

摘要

This invention relates to a power amplifier for a mobile communication device. The power amplifier improves the efficiency and the linearity by controlling the input voltage of the peakin amplifier (130). The power amplifier operates at the Doherty mode when the output power from the voltage-control means (170) is in the low range. For the higher output power, the control input (80) to the peaking amplifier (130) is increased up to such a point for satisfying the non-linear property of the power amplifier.