Three-level buck converter for envelope tracking in RF power amplifiers
Three-level buck converter for envelope tracking in RF power amplifiers
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DOI：
10.1109/apec.2005.1453248
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
V. Yousefzadeh;Eduard Alarcon;D. Maksimović
中科院分区：
文献类型：
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作者：
V. Yousefzadeh;Eduard Alarcon;D. Maksimović
本文提出了一种三电平降压转换器，用于射频功率放大器 (RFPA) 中的高效宽带包络跟踪。重点是低功耗电池供电系统，目标是实现包络消除和恢复 (EER) 技术的实际实施，该技术理论上可以实现用于非恒定包络调制的高线性、高效 RFPA。在纹波、开关频率和带宽权衡方面，结果表明，三电平降压转换器与两相配置类似，但在功率级中采用单个电感器。此外，还提出了一种用于调节快速电容器电压的数字控制技术，以确保信号跟踪保真度。实验结果表明，在跟踪两音测试信号包络的说明性案例中，三电平降压转换器原型在效率和纹波抑制方面具有改进的性能
This paper proposes a three-level buck converter for efficient wide-bandwidth envelope tracking in RF power amplifiers (RFPA). The focus is on low-power battery-operated systems, and the goal is to enable practical implementation of the envelope elimination and restoration (EER) technique, which theoretically allows realization of a highly linear, highly efficient RFPA for non-constant envelope modulations. In terms of ripple, switching frequency and bandwidth tradeoffs, it is shown that the three-level buck converter is similar to the two-phase configuration, while employing a single inductor in the power stage. Additionally, a digital control technique for regulation of the flying capacitor voltage is proposed to ensure signal tracking fidelity. Experimental results show the improved performance of a three-level buck converter prototype as regards efficiency and ripple rejection for the illustrative case of tracking the envelope of a two-tone test signal