| 摘要 |
PURPOSE: An auto gain control system is provided to maintain an output signal of a power amplifier module stably by calculating the amount of gain change accurately. CONSTITUTION: In an auto gain control system, a first attenuator(110) is connected to a transmission output terminal of a transceiver(200). A second attenuator(120) is connected to an input terminal of a power amplifier module(300), and the first attenuator is operated by a digital method. A second attenuator is operated by an analog method, and a combiner(130) is connected between an output terminal and an RF switch(400) of the power amplifier module. A sensor(140) produces a sensing signal by sensing the output change of the power amplifier module. A filter(150) delays a signal, and a comparator(160) compares the sensed signal with a reference voltage recorded at a storage(170) by 0.01V unit. |
