3.54GHz 10W envelope tracking amplifier with 43% efficiency utilizing the 1.5 bit-high efficiency envelope amplifier
3.54GHz 10W envelope tracking amplifier with 43% efficiency utilizing the 1.5 bit-high efficiency envelope amplifier
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3.54GHz%2010W%20envelope%20tracking%20amplifier%20with%2043%%20efficiency%20utilizing%20the%201.5%20bit-high%20efficiency%20envelope%20ampler
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Jung
中科院分区：
文献类型：
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作者：
J. Kim;Gwan Do Jo;J. Oh;Young Hoon Kim;Kwangchun Lee;J. Jung
为了提高宽带高线性包络跟踪功率放大器的整体效率，提出了一种1.5位（3电平）包络放大器。所提出的包络放大器已被设计为具有两个开关，提供不同的电源电压。由于不必要的电流（涟漪电流）引起的开关级可以通过多电平量化减少，建议的包络放大器的效率是5%，比传统的架构。利用所提出的包络放大器，我们设计并实现了3.54GHz的高效率包络跟踪功率放大器，使用商业60 W PEP GaN器件。实测结果进一步验证了该方法的效率提升效果。实验结果表明，对于峰均功率比（PAPR）为8.5dB的10 MHz WiMAX信号，当平均输出功率为40 dBm时，包络跟踪功率放大器的漏极效率（DE）为43.6%，功率附加效率（PAE）为39.2%，增益为10.1dB。通过使用数字预失真功能，在20 MHz偏移处，邻道泄漏比（ACLR）小于−45.4dBc。
This paper presents a 1.5 bit (3-level) envelope amplifier to improve the overall efficiency of wideband high linearity envelope tracking power amplifier. The proposed envelope amplifier has been devised with two switches providing the different supply voltages. Since the unnecessary current (ripple current) induced by a switching stage can be reduced by the multi-level quantization, the efficiency of a proposed envelope amplifier is 5% higher compared with that of a conventional architecture. With the proposed envelope amplifier, we have designed and implemented the 3.54GHz high efficiency envelope tracking power amplifier using a commercial 60W PEP GaN device. The efficiency boosting effect is further verified by the measured results. The experiment results show that the envelope tracking power amplifier operates at drain efficiency (DE) of 43.6% and power added efficiency (PAE) of 39.2% and a gain of 10.1dB at average output power of 40 dBm for a 10MHz WiMAX signal with 8.5 dB peak-to-average power ratio (PAPR). By using digital predistortion function, the adjacent channel leakage ratio (ACLR) is less than −45.4dBc at 20MHz offset.