Preferably, the current detection feedback circuit includes a first detection circuit and a first feedback circuit, wherein an output end of the first detection circuit is connected to an input end of the first feedback circuit. An input end of the first detection circuit is connected to the input end of the current stage of amplifier circuit by means of a corresponding resistor. An output end of the first feedback circuit is connected to the input end of the at least one stage of amplifier circuit prior to the current stage of amplifier circuit.

Preferably, the input end of the first feedback circuit is connected to an output end of a second detection circuit. The detected output power of the current stage of amplifier circuit is input into the first feedback circuit through the second detection circuit.

Preferably, the power detection feedback circuit includes a second detection circuit and a second feedback circuit, wherein an output end of the second detection circuit is connected to an input end of the second feedback circuit. An input end of the second detection circuit is connected to the output end of the at least one stage of amplifier circuit. An output end of the second feedback circuit is connected to the input ends of the current stage of amplifier circuit and the at least one stage of amplifier circuit located prior to the current stage of amplifier circuit.

Preferably, the first detection circuit consists of a first resistor. The second detection circuit is formed by connecting a fifth resistor and a first capacitor in series.

Preferably, the second detection circuit consists of the first capacitor.