| 摘要 |
An adjustable gain power amplifier, a gain adjustment method and a mobile terminal. The adjustable gain power amplifier comprises an input matching circuit (201), a gain adjustment circuit (202), a biasing circuit (203), a main amplification circuit (204), and an output matching circuit (205); the input matching circuit (201) is connected between an input end and the gain adjustment circuit (202); the gain adjustment circuit (202) is connected between the input matching circuit (201) and the input end of the main amplification circuit (204); the output end of the main amplification circuit (204) is connected to the output matching circuit (205), a positive power source end thereof is connected to a power supply source, a negative power source end thereof is connected to the biasing circuit (203); the biasing circuit (203) provides different biasing voltages for the main amplification circuit (204); and the gain adjustment circuit (202) and the biasing circuit (203) are respectively connected to a gain adjustment control voltage (Vctrl). The circuit has a simple structure and is convenient to integrate, and gain adjustment requirements in a multi-power mode can be satisfied without a need of a power switching switch, thus realizing the output of a larger dynamic range. |
