INTELLIGENT SWITCHING MODE POWER AMPLIFYING APPARATUS

摘要

Disclosed is an intelligent switching mode power amplifying apparatus. According to the apparatus of the invention, a power stage is differently operated in three modes according to the amplitude of an output power of a power amplifier module to ensure a high efficiency even with a low output power, and a variable output matching block uses two switches to obtain power amplifiers which are simplified and small-sized compared to a complicated switching mode power amplifier module of the related art as well as to decrease the loss due to the switches by a large margin. Further, a variable gain amplifying stage is operated corresponding to the three modes so that the power amplifier module can be maximized in linearity. Therefore, the invention can prolong the maximum-talk time and improve talk quality in the portable terminal having the power amplifier.