AC-Stacked Power Amplifier for APT/ET LTE HPUE Applications

Abstract

Mainly due to the increase in the number of corresponding bands, and to the HPUE (High Power User Equipment) operation, the power amplifier for the mobile phone terminal is required to increase the maximum output power and gain at the same time. There are several ways to increase the transmit power, but here we have applied an AC-stacked method that combines the emitter ground transistor and the base ground transistor with the capacitor. By applying this method and prototyping a 2.5 GHz power amplifier module, we achieved a gain of approximately 34 dB and a linear output 29dBm at a 3.4 V supply voltage and confirmed the output of the 31dBm in the ET operation.