Design of high-efficiency power amplifier based on π-type harmonic control network
In order to enhance the efficiency of the communication system,a π-type harmonic control network based on class F theory is proposed.In this network,the DC bias circuit is used to introduce second harmonic short-circuit points,thereby simplifying the complexity of the harmonic control circuit.Simultaneously,it can ensure that the second and third harmonic impedance is not affected by the subsequent fundamental wave matching circuit.In order to mitigate the impact of parasitic parameters on transistor core leakage extreme impedance,an L-type parasitic compensation circuit is introduced between the π-type harmonic control network and the transistor,so as to realize the second harmonic impedance approaching zero and the third harmonic impedance approaching infinity.In order to validate the feasibility of the designed network,a high-efficiency class-F power amplifier is designed and simulated.The results show that within the operating frequency band of 1.8～2.1 GHz,the saturated output power is 43.21～44.84 dBm,the gain is 13.21～14.84 dB,and the power-added-efficiency is 69.59%～73.54%.It confirms that the proposed π-type harmonic control network can effectively meet performance requirements for the high-efficiency amplifier design.
class-F power amplifierwork efficiencyπ-type harmonic control networkharmonic impedanceL-type parasitic compensation circuitjoint simulation
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维普
