【摘要】 针对未来无线通信系统中的宽带和效率问题,设计了一种宽带高效率的J类功率放大器。为了减少谐波阻抗对效率的影响,该J类功率放大器在输出匹配网络中采用了谐波控制单元,并通过对晶体管模型的简化,综合出一种较好的匹配网络。另外,在输入匹配网络中,使用了具有宽带效应的混合集中和分布元件的π形匹配网络。设计中使用10 W GaN HEMT晶体管对理论进行验证,测试结果显示,在2.2 GHz～2.8 GHz之间的频带内,J类功率放大器的漏极效率大于61%,增益大于10.4 dB。该J类功率放大器在下一代无线通信系统中具有良好的应用前景。更多还原

【Abstract】 In the view of thebroadband and efficiency in the future communication system,abroadband,highly efficient class J power amplifier has been designed.Consideringthe effect of the harmonic impedances,we add the harmonic controlled unit to the output matching network and simplify the model of the transistor in the Class J power amplifier,so a preferable matching network can be got.Besides,we use the pi section matching network which contains lump and distribution elements as the input matching network.The method is justified using a 10 W GaN HEMT.The measured data show that it achieves the Drain Efficien cy(DE)of above 61% and the gain of above 10.4 dB at the frequency range from 2.2 GHz to 2.8 GHz.the designed Class J power amplifier is suitable for the next generation wireless communication system.更多还原