Amplitude modulation system for e.g. a transmitter of a mobile station includes power amplifier with automatic gain control system

摘要

The amplitude modulation system has a radio frequency power amplifier (PA). The amplifier output signal (G) is controlled by generating an error signal (U) between an amplitude modulated signal (C) and an output signal (L), generating a gain control signal (F). The gain control signal monitors potential amplifier saturation. When the amplifier saturates a correction signal (W) is generated lowering the amplifier operating point.