Highly Efficient Concurrent Power Amplifier With Controllable Modes
Highly Efficient Concurrent Power Amplifier With Controllable Modes
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DOI：
10.1109/tmtt.2015.2486759
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发表时间：
2015-10
影响因子：
4.3
通讯作者：
Yinjin Sun;Xiaowei Zhu;Jianfeng Zhai;Lei Zhang;F. Meng
中科院分区：
文献类型：
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作者：
Yinjin Sun;Xiaowei Zhu;Jianfeng Zhai;Lei Zhang;F. Meng
提出了一种并行双模功率放大器(PA)的可控模式设计方法。从低通匹配电路的频率响应出发，分析了不同高效功放模式的特点，提出了可控模式合成的原理。然后以F-1类和J类双模功放为例，验证了这种模式组合的概念。在1.9~2.0 GHz和2.3~2.6 GHz两个频率范围内，设计了输出功率为10W的GaN器件PA。测试结果表明，两个频段的输出功率为40.2~42.9dBm，漏极效率分别为75.6~80.3%和76.6~68.8%。在1.7~2.8 GHz的频率范围内，漏极效率为60~80.3%。为了评估其在并发多频带和宽带应用中的调制信号性能，使用了具有140 MHz和300 MHz频率间隔的双频信号(20 MHz+20 MHz)以及两种模式下的100 MHz长期演进推进(LTE-A)信号。采用数字预失真算法，邻道泄漏比分别小于-47.5、-48.6和-46.1dBc，表明其在移动通信系统中具有良好的性能。
This paper presents a controllable mode design method for a concurrent dual-mode power amplifier (PA). The principle of the controllable mode combination is proposed by investigating the characteristics of different highly efficient PA modes, which is analyzed from frequency response of the low-pass matching circuit. Then a dual-mode PA with Class- F-1 and Class-J mode is taken for example to verify this mode combination concept. A GaN device PA with 10-W output is designed at two frequency ranges of 1.9 ~ 2.0 GHz and 2.3 ~ 2.6 GHz. Measurement results show an output power of 40.2 ~ 42.9 dBm and drain efficiency of 75.6 ~ 80.3% and 76.6 ~ 68.8% in two frequency bands. It also provides a broadband operation with drain efficiency of 60 ~ 80.3% over 1.7 ~ 2.8 GHz. To evaluate its modulated signal performance with concurrent multiband and broadband applications, dual-band signals (20 MHz + 20 MHz) with 140- and 300-MHz frequency spacing and 100-MHz long-term evolution advanced (LTE-A) signals at two modes are both employed. With digital pre-distortion algorithm, adjacent channel leakage ratio lower than -47.5, -48.6 and -46.1 dBc are achieved, indicating its excellent performance in mobile communication systems.