Electronic apparatus comprising a power amplifier

摘要

A power control apparatus for minimizing energy losses in a radio transmitter uses a variable-output switched-mode power supply to control a voltage applied to an output power amplifier stage of the radio transmitter. By monitoring a current drawn by the output power amplifier operating in a Class D mode, an error signal is generated that regulates the applied voltage, such that only a minimally-sufficient voltage is supplied to the output amplifier for a given transmitted output power.