摘要
The impedance characteristics of distributed amplifiers are analyzed based on T-type matching networks, and a distributed power amplifier consisting of three gain cells is proposed. Non-uniform T-type matching networks are adopted to make the impedance of artificial transmission lines connected to the gate and drain change stage by stage gradually, which provides good impedance matching and improves the output power and efficiency. The measurement results show that the amplifier gives an average forward gain of 6 dB from 3 to 16. 5 GHz. In the desired band, the input return loss is typically less than - 9. 5 dB, and the output return loss is better than -8.5 dB. The output power at 1-dB gain compression point is from 3.6 to 10. 6 dBm in the band of 2 to 16 GHz while the power added efficiency （PAE） is from 2% to 12. 5% . The power consumption of the amplifier is 81 mW with a supply of 1.8 V, and the chip area is 0.91 mm × 0.45 mm.
基于T型匹配网络对分布式放大器的阻抗特性进行了分析,并设计了一个三级分布式功率放大器.设计中采用非均匀的T 型匹配网络结构使得与栅极和漏极相连的人工传输线阻抗逐级渐变,实现阻抗匹配的 同时提升了放大器的输出功率及效率.测试结果表明：该放大器在频带3 - 16.5 GHz带宽内平均增益为6dB,输入回波损耗小于-9.5 dB,输出回波损耗小于-8.5 dB;2 -16GHz频带内的1 dB增益压缩点处输出 功率达到3.6 -10. 6 dBm,功率附加效率为2%-12. 5%.电源电压为1.8 V 时放大器功耗为81 mW,芯片面积为0.91 mm×0.45 mm.
基金
The National Natural Science Foundation of China(No.61106021)
the Postdoctoral Science Foundation of China(No.2015M582541)
the Natural Science Foundation of Higher Education Institutions of Jiangsu Province(No.15KJB510020)
the Research Fund of Nanjing University of Posts and Telecommunications(No.NY215140,No.NY215167)
