Broadband Efficiency-Enhanced Mutually Coupled Harmonic Postmatching Doherty Power Amplifier
Broadband Efficiency-Enhanced Mutually Coupled Harmonic Postmatching Doherty Power Amplifier
复制标题
宽带效率增强型互耦合谐波后匹配 Doherty 功率放大器
DOI：
10.1109/tcsi.2017.2658689
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Derek Ho
中科院分区：
文献类型：
--
作者：
Xin Yu Zhou;Shao Yong Zheng;Wing Shing Chan;Shichang Chen;Derek Ho
The postmatching topology is an effective approach for broadening the bandwidth of a Doherty power amplifier (DPA). Its efficiency can be enhanced using a second-harmonic short-circuit network (SHSN), but at the expense of bandwidth. In this paper, the SHSNs with mutual coupling are proposed to achieve efficiency enhancement without sacrificing bandwidth. A broadband Doherty amplifier was designed and fabricated based on commercially available gallium nitride HEMT (Cree CGH 40006P) devices to validate the proposed technique. Under continuous-wave excitation, the measured results of the proposed DPA demonstrated that a wide bandwidth of 40% (1.8–2.7 GHz) can be maintained, with the 6-dB back-off drain efficiency between 47.5% and 54%. Using a wideband code-division multiple access 3GPP test signal with the peak-to-average power ratio of 6.6 dB, the adjacent channel power ratio over the entire frequency band is below −30 and −25 dBc at a 6-dB back-off and saturation, respectively.
