| 摘要 |
A power amplifier module is provided to prevent internal circuits thereof from being damaged by an external signal such as ESC(Electro Static Discharge). A power amplifier module includes a driving amplifying unit(130), a power amplifying unit(150), an output detection unit(170), and an impedance conversion unit(180). The driving amplifying unit adjusts the gain of a signal. The power amplifying unit amplifies the power of the gain-adjusted signal. The output detection unit is coupled to an output stage of the power amplifying unit and divides a part of the amplified signal if the power value of the amplified signal is larger than a predetermined value. The impedance conversion unit is coupled to an input stage of the driving amplifying unit and the output detection unit. The impedance conversion unit isolates an external signal transmitted from the output detection unit. The impedance conversion unit changes the impedance of the input stage of the driving amplifying unit according as the output detection unit is operated. |
