Power switching circuit of radio frequency power amplifier

The utility model relates to a power switching circuit of a radio frequency power amplifier. The switching circuit comprises a high-power amplification path, a low-frequency amplification path and a control circuit, wherein the high-power amplification path and the low-power amplification path are arranged side by side. The input end of the high-power amplification path and the input end of the low-power amplification path are respectively connected with a bridging capacitor in series, and an independent diverter switch is connected in at least one power amplification path in series. The control circuit controls the output in the at least one power amplification path as needed. Preferably, the independent diverter switch is connected between a power amplifier of the corresponding power amplification path and a matched network in series. According to the power switching circuit, the efficiency of the power amplifier is effectively improved, the difficulty of circuit design is reduced, meanwhile, devices in the circuit can be obtained by the adoption of the CMOS or SOI technology, all the devices can be integrated on the same chip, the area of the circuit is reduced, the integration level is improved, and the cost is effectively reduced.