Doherty amplifier with envelope tracking for high efficiency
Doherty amplifier with envelope tracking for high efficiency
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Doherty 放大器具有包络跟踪功能，可实现高效率
DOI：
10.1109/mwsym.2010.5518222
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Bumman Kim
中科院分区：
文献类型：
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作者：
J. Moon;Junghwan Son;Jungjoon Kim;Ildu Kim;S. Jee;Y. Woo;Bumman Kim
采用2.14 GHz GaN HEMT饱和功率放大器（PA），设计了一种电源调制器辅助的Doherty放大器。一种新的包络整形方法，适用于高功率附加效率（PAE）在较宽的输出功率范围。与Doherty和饱和PA与电源调制器进行了实验比较。对于8 dB波峰因数WCDMA 1FA信号，与独立Doherty PA相比，调制器支持的Doherty PA在宽输出功率范围内提供了改进的PAE。此外，由于Doherty PA的峰值因数包络信号较低，因此与采用电源调制器的饱和PA相比，它可以实现更好的PAE。在最大平均输出功率下，从峰值功率回退8 dB，采用偏置自适应的Doherty放大器显示出50.9%的PAE，而具有电源调制器和独立饱和Doherty放大器的可比饱和PA和饱和PA分别提供42.3%、49.7%和35.0%的PAE。
A Doherty amplifier assisted by a supply modulator is presented using 2.14 GHz GaN HEMT saturated power amplifier (PA). A novel envelope shaping method is applied for high power-added efficiency (PAE) over a broad output power range. Experimental comparison with the Doherty and saturated PAs with the supply modulator is carried out. For the 8 dB crest factor WCDMA 1FA signal, the Doherty PA supported by the modulator presents the improved PAE over the broad output power region compared to the standalone Doherty PA. In addition, it achieves better PAE than the saturated PA with the supply modulator due to the lower crest factor envelope signal applied to the Doherty PA. At the maximum average output power, back-off by 8 dB from the peak power, the Doherty amplifier employing bias adaptation shows the PAE of 50.9%, while the comparable saturated PA with supply modulator and standalone saturated Doherty amplifier and saturated PA provide the PAEs of 42.3%, 49.7%, and 35.0%, respectively.