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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >A 65% efficient envelope tracking radio-frequency power amplifier for orthogonal frequency division multiplex
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A 65% efficient envelope tracking radio-frequency power amplifier for orthogonal frequency division multiplex

机译：用于正交频分复用的效率为65％的包络跟踪射频功率放大器

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摘要

A high-efficiency radio-frequency (RF) power amplifier (PA) is described for high peak-to-average power ratio (PAPR) orthogonal frequency division multiplexed signals. Envelope tracking is used, where the supply voltage of an RF amplifier is modulated in harmony with the envelope of the RF signal. The envelope modulator is a split-frequency design composed of a switched mode power supply (SMPS) for the low-frequency content, and a hybrid amplifier for the high-frequency part. The hybrid amplifier combines digital switching with a linear amplifier in a transformer coupled push-pull structure. For verification, a 7 dB PAPR 3 MHz bandwidth 3rd generation partnership project long-term evolution (LTE) signal is used. When amplifying the AC component of the LTE envelope signal, 56.2% efficiency is achieved by the hybrid amplifier at 4.6 W output power into a 10 Ω load. Combined with a 94.4% efficient SMPS, the modulator can produce 23.4 W at 83% efficiency. This is combined with an 80.3% efficient 300 MHz RF PA. Together they achieved 65.6% DC-to-RF efficiency at 18.2 W RF output power. The measured PAPR at the amplifier output was 6.5 dB.
机译：描述了一种用于高峰均功率比（PAPR）正交频分复用信号的高效射频（RF）功率放大器（PA）。使用包络跟踪，其中射频放大器的电源电压与射频信号的包络线相协调。包络调制器是一种分频设计，由用于低频内容的开关电源（SMPS）和用于高频部分的混合放大器组成。混合放大器以变压器耦合推挽结构将数字开关与线性放大器相结合。为了进行验证，使用了7 dB PAPR 3 MHz带宽的第三代合作伙伴项目长期演进（LTE）信号。当放大LTE包络信号的AC分量时，通过混合放大器在4.6 W输出功率下向10Ω负载实现56.2％的效率。结合效率为94.4％的SMPS，该调制器可以以83％的效率产生23.4 W的功率。结合了效率为80.3％的300 MHz RF PA。他们共同在18.2 W的RF输出功率下实现了65.6％的DC-RF效率。在放大器输出端测得的PAPR为6.5 dB。

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