RF power amplifiers and electronic device

A radio frequency power amplifier, comprising:

• a main amplifier configured to output a first amplified signal;
• a main matching circuit directly connected between the main amplifier and a combining node, comprising at least one-stage impedance matching circuit and configured to adjust a phase of the first amplified signal and raise an output impedance of the main amplifier to a first impedance;
• an auxiliary amplifier configured to output a second amplified signal;
• an auxiliary matching circuit directly connected between the auxiliary amplifier and the combining node, comprising a multi-stage impedance matching circuit and configured to adjust a phase of the second amplified signal and raise an output impedance of the auxiliary amplifier to a second impedance, wherein an impedance at the combining node is a combined impedance of the first impedance and the second impedance, which is greater than the output impedance of the main amplifier and the output impedance of the auxiliary amplifier thereby improving an impedance bandwidth;
• and
• an impedance conversion circuit directly connected to the combining node and configured to raise the impedance at the combining node to a transmission impedance thereby improving power added efficiency after deep power back-off;
• wherein the auxiliary matching circuit is configured to adjust the phase of the second amplified signal by 180 degrees.