GaAs MMIC high-power high-efficiency power amplifier chip

The invention belongs to the technical field of power amplifiers, and discloses a GaAs MMIC high-power and high-efficiency power amplifier chip which comprises an input matching network, a stability network, a biasing circuit, a low-loss interstage matching network and a low-loss output matching network. The input matching network comprises a lossy element, a blocking capacitor, an input matching circuit, a biasing circuit and a stability network, and the input matching network is connected to the input end of the power amplifier; the low-loss inter-stage matching network is positioned between different amplification stages of the power amplifier; the low-loss output matching network is connected to the output end of the power amplifier and comprises a group of parallel capacitors and series inductors; the bias circuit is connected to each amplification stage of the power amplifier; the stability network is connected with the input matching network and the bias circuit. The output power and the power addition