Circuit for reducing memory effect of radio-frequency power amplifier, output circuit of radio-frequency power amplifier, and radio-frequency power amplifier

The embodiment of the invention provides a circuit for reducing the memory effect of a radio-frequency power amplifier, an output circuit of the radio-frequency power amplifier, and the radio-frequency power amplifier. The harmonic impedance of the radio-frequency power amplifier can be controlled in an optimal range while the memory effect of the radio-frequency power amplifier is reduced. The circuit for reducing the memory effect of the radio-frequency power amplifier comprises a first micro-strip line, a second micro-strip line, a first capacitor and a second capacitor, wherein one end of the first micro-strip line is connected with one end of the second micro-strip line; one end of the first capacitor is connected with one end of the first micro-strip line; the other end of the first capacitor is grounded; one end of the second capacitor is connected with the other end of the second micro-strip line; the other end of the second capacitor is grounded; for the fundamental impedance and the envelop impedanc