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对T型匹配网络构成的人工传输线的阻抗匹配特性进行了讨论,在此基础上,采用0.18μm CMOS工艺,设计了一种宽带分布式功率放大器。设计中,通过减小栅极人工传输线的吸收负载,在放大器输入端获得了良好的阻抗匹配;通过在放大器输出端增加1个L型阻抗匹配网络,实现了输出端阻抗匹配,同时有效提升了分布式放大器的增益和输出功率。仿真结果显示,该放大器3dB带宽达到17GHz,2~18GHz频率范围内,增益为10.5dB,带内增益平坦度为±0.5dB,输出功率为4.9~9.85dBm,PAE效率为5%~15.6%,表现出良好的综合性能。
The impedance matching characteristics of the artificial transmission line formed by T-matching networks are discussed. Based on the above, a 0.18μm CMOS process is adopted to design a broadband distributed power amplifier. In the design, a good impedance matching is obtained at the input end of the amplifier by reducing the absorption load of the artificial transmission line of the gate. By adding an L-type impedance matching network at the output of the amplifier, impedance matching at the output end is achieved and the output impedance is effectively improved Distributed amplifier gain and output power. The simulation results show that the 3dB bandwidth of the amplifier reaches 17GHz and the gain is 10.5dB in the frequency range of 2 ~ 18GHz. The in-band gain flatness is ± 0.5dB, the output power is 4.9 ~ 9.85dBm, PAE efficiency is 5% ~ 15.6% Show good overall performance.