The power amplifier (PA) of the handset is always the most power-hungry part of the phone, and the average power consumption of the PA is reduced, which can significantly increase the call time.
An electronic device usually contains a multi-stage amplifier circuit, in addition to the small signal voltage amplification of the pre-amplifier circuit, the output level generally also drive a certain load.
PA (power amplifier) refers to the amplifier can output high-power signal amplifier.
