Push-pull radio-frequency power amplifier with improved linearity and efficiency

Abstract

The invention discloses a push-pull radio-frequency power amplifier with improved linearity and efficiency, comprising an input matching network, an output matching network and a power amplification circuit, wherein the power amplification circuit comprises a first-stage amplification circuit and a second-stage amplification circuit, the first-stage amplification circuit is connected with the input matching network, the second-stage amplification circuit is connected between the first-stage amplification circuit and the output matching network, and the second-stage amplification circuit is an NPN-NPN push-pull amplification circuit composed of a second common collector amplifying tube and a second common-emitter amplifying tube. The output matching network is an output filter matching network which comprises a secondary harmonic series resonance network, a third harmonic series resonance network and a stopping condenser, wherein the secondary harmonic series resonance network is connected between the output end of the second-stage amplification circuit and the ground, the third harmonic series resonance network is connected between the output end of the secondary harmonic series resonance network and the stopping condenser, and the stopping condenser is connected between the third harmonic series resonance network and the power amplifier. The invention improves the additional efficiency of the radio-frequency power amplifier and improves the linearity of the radio-frequency power amplifier.

Description

technical field [0001] The invention relates to a push-pull radio frequency power amplifier with improved linearity and efficiency. Background technique [0002] RF power amplifiers are widely used in many fields today, such as: wireless radio frequency communications; wireless and cable television broadcasting; cables and other wired transmission systems; optical drive amplifiers; audio systems; radar, etc. The RF power amplifier is located at the back end of the transmitter and is used to amplify the RF signal and achieve a certain output power. Because the power amplifier consumes a lot of DC power, the power-added efficiency is an important index that should be considered first when designing the power amplifier. If the envelope of the signal waveform contains information, the power amplifier should amplify the signal without distortion, so the linearity of the power amplifier is also an important indicator. So improving the power-added efficiency of the circuit and im...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to: provide a push-pull radio frequency power amplifier with improved linearity and efficiency, which solves the problems that the traditional NPN-PNP complementary HBT push-pull structure power amplifier is difficult to realize in technology and the output waveform is not completely symmetrical; and Improve the power-added efficiency of the radio frequency circuit and improve the linearity of the radio frequency circuit

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