A linear assisted DC/DC converter for Envelope Tracking and Envelope Elimination and Restoration applications
A linear assisted DC/DC converter for Envelope Tracking and Envelope Elimination and Restoration applications
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用于包络跟踪、包络消除和恢复应用的线性辅助 DC/DC 转换器
DOI：
10.1109/ecce.2010.5617762
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Sebastián
中科院分区：
文献类型：
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作者：
P. Miaja;Miguel Rodriguez;Alberto Rodríguez;J. Sebastián
近年来，在开发快速且有效的DC/DC转换器方面已经做出了巨大努力，以便通过使用诸如包络跟踪和包络消除和恢复的技术来跟随通信信号的包络以增加射频功率放大器的效率。然而，现代通信信号所需的带宽和转换速率高于为此目的而制造的开关DC/DC转换器可实现的最大转换速率。这些开关DC/DC转换器的压摆率可以通过将其与线性级的使用相结合来改善，从而在压摆率和总体效率之间建立折衷。本文介绍了一种简单的方法，可将开关DC/DC转换器、多输入降压转换器和线性级结合使用，以获得100 V/µs以上的压摆率，同时适度降低总体效率（81%的效率跟踪EDGE标准信号的包络）。最后，本文给出了一个完整的系统（包括两级的数字控制）的原型。
In recent years, there has been a great effort in the development of fast and efficient DC/DC converters in order to follow the envelope of communication signals for increasing the efficiency of Radio Frequency Power Amplifiers by using techniques such as Envelope Tracking and Envelope Elimination and Restoration. However the bandwidth and slew rate required by modern communication signals is higher than the maximum slew-rate achievable by switching DC/DC converters made for these purpose. The slew rate of these switching DC/DC converter can be improved by combining it with the use of a linear stage, thus establishing a trade-off between slew rate and overall efficiency. This paper presents a simple way of combining the use of both a switching DC/DC converter, the Multiple Input Buck Converter, and a linear stage to obtain slew-rates above 100 V/µs, with a moderate decrease in the overall efficiency (81% efficiency tracking the envelope of an EDGE standard signal). Finally, a prototype of the complete system (including the digital control for both stages) is presented in this paper.