Radio frequency power amplifier based on transformer matching

A radio frequency power amplifier based on transformer matching, including:

• a first-stage amplification circuit configured with an input terminal for receiving a radio frequency input signal and an output terminal connected to an input terminal of a second-stage amplification circuit, wherein the output terminal of the first-stage amplification circuit is also configured to be connected to one terminal of a main coil of a first transformer, to be connected to a power supply voltage through the main coil of the first transformer;
• the first transformer configured to include the main coil and a secondary coil, wherein the main coil is configured between the power supply voltage and the output terminal of the first-stage amplification circuit, and one terminal of the secondary coil is grounded and the other terminal of the secondary coil is connected to a medium-low power mode input terminal of a power switch through a first capacitor;
• the second-stage amplification circuit configured with the input terminal for receiving the amplified radio frequency signal from the first-stage amplification circuit, and its output terminal configured to be connected to a high power mode input terminal of the power switch;
• and
• the power switch configured as a single-pole double-throw switch or a single-pole multi-throw switch, wherein the power switch is configured to be connected with the medium-low power mode input terminal when the radio frequency power amplifier works in the medium-low power mode, and to be connected with the high power mode input terminal when the radio frequency power amplifier works in the high power mode.