| 摘要 |
<p>A power amplifier and a gain switching circuit thereof. The gain switching circuit comprises: an amplification unit, provided with a bias input end and accessing a bias voltage; a signal input end, accessing a first input signal; a control end, accessing a control signal; an output end, outputting a gained output signal; and a gain control unit, accessing an input signal and outputting the first input signal, accessing a driving signal, and outputting the control signal according to the driving signal. The amplification unit switches a gain coefficient of the gained output signal according to the control signal.</p> |
