Biasing circuit of radio frequency power amplifier

The invention discloses a biasing circuit of a radio frequency power amplifier. wherein the biasing circuit is used for providing bias voltage for a power amplification link provided with a power tube, the biasing circuit comprises a first bias link and a second bias link, the first bias link comprises a first differential amplifier, a first voltage division branch, a second voltage division branch and a first active driving branch, and the provided first bias voltage presents a negative temperature coefficient along with the change of temperature; the second bias link comprises a second differential amplifier, a third voltage division branch, a fourth voltage division branch and a second active driving branch, and the provided second bias voltage presents a positive temperature coefficient along with the change of temperature; and the first bias voltage and the second bias voltage are superposed and then are output to the power tube. The biasing circuit provides appropriate bias voltage for the power tube ac