基于GaN HEMT的宽带高效率滤波Doherty功率放大器

Broadband High Efficiency Filtering Doherty Power Amplifier Based on GaN HEMT

将高效率线性化特性放大器与宽带带通滤波特性相结合,提出了一种具有滤波特性的宽带高效率Doherty功率放大器,其滤波特性通过宽带滤波功率分配器与具有滤波特性的后匹配网络实现。采用阶跃式阻抗匹配方法对主辅功放的输入输出匹配电路进行宽带匹配。使用CGH40010F GaN HEMT晶体管设计并制作了一款宽带高效率滤波Doherty功率放大器。测试结果显示,在2.3~2.7 GHz频带内,饱和输出功率达到44.6 dBm,饱和漏极效率在66.4%~77.6%之间,输出功率回退6 dB时的漏极效率为51%~62%。

Combining the high efficiency linearization characteristic amplifier with the broadband bandpass filtering characteristic,a broadband high efficiency Doherty power amplifier with filtering characteristic is proposed.The filtering characteristic of the proposed power amplifier is realized by a broadband filtering power divider and a post-matching network with filtering characteristic.The step impedance matching method is used to perform broadband matching on the input and output matching circuits of the main and auxiliary power amplifiers.A broadband high efficiency filtering Doherty power amplifier is designed and fabricated by using CGH40010F GaN transistor.Measured results show that the saturated output power reaches 44.6 dBm,and the saturated drain efficiency is between 66.4%to 77.6%in the 400 MHz frequency band of 2.3-2.7 GHz.When the output power is backed off by 6 dB,the drain efficiency is 51%-62%.