High-efficiency X-band MMIC GaN power amplifiers with supply modulation
High-efficiency X-band MMIC GaN power amplifiers with supply modulation
复制标题
具有电源调制功能的高效 X 波段 MMIC GaN 功率放大器
DOI：
10.1109/mwsym.2014.6848545
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Z. Popovic
中科院分区：
文献类型：
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作者：
Andrew H. Zai;Dongxue Li;Scott Schafer;Z. Popovic
本文介绍了供调制x波段0.15μm门宽GaN HEMT MMIC功率放大器对OFDM信号的测量结果。在10GHz和10W输出功率下，两个PAs的峰值连续波效率分别为69%和55%，增益分别为8.5和20.4 dB。根据每个MMIC - PA的静态特性设计了电源调制轨迹，并通过线性宽带调制器和高效5-MHz开关调制器进行漏极调制。在四种模式下对PAs进行测试：(1)使用恒定的20v电源，通过驱动器输入18mhz OFDM信号；(2)纯包络跟踪；(3)分路供电调制；(4)采用5mhz开关调制器进行包络消除和恢复（EER）。比较了4瓦PA和线性调制器的平均PAE和复合功率增加效率，分别达到65.4%和35%。
This paper presents measurement results on supply-modulated X-band 0.15μm gate width GaN HEMT MMIC power amplifiers for OFDM signals. Two PAs at 10GHz with 4 and 10W output powers show peak CW efficiencies of 69% and 55%, with gains of 8.5 and 20.4 dB respectively. Supply modulation trajectories are designed by static characterization of each MMIC PA, and the drain modulation is performed though both a linear broadband modulator and a high-efficiency 5-MHz switching modulator. The PAs are tested in four modes: (1) with a constant 20-V supply and the 18-MHz OFDM signal input through the drive; (2) pure envelope tracking; (3) signal-split supply modulation; and (4) envelope elimination and restoration (EER) with a 5-MHz switching modulator. Average PAE and composite power added efficiencies are compared, reaching 65.4% and 35%, respectively, with the 4-W PA and a linear modulator.