Circuit structure and control method of low-noise amplifier

The invention relates to the technical field of amplifying circuits, in particular to a circuit structure of a low-noise amplifier and a control method. The circuit structure comprises a second power supply, a third resistor, a second switch tube, a first capacitor and a second capacitor. The second power supply is connected with the first end of the third resistor, and the second end of the third resistor is connected with the first end of the second switch tube; the second end of the second switch tube is connected with the third end of the active amplifier tube; the third end of the second switch tube is grounded; the first end of the third switch tube is connected with the first power supply, the second end of the third switch tube is connected with the second end of the first capacitor, and the first end of the second capacitor is connected with the first end of the second blocking capacitor; the third end of the third switching tube is connected with the first end of the second capacitor; the second end