高速电压随动电源的发展及面临的挑战

Development and Design Challenges of High Speed Envelope Tracking Power Supply

随着3G通信时代的到来,新的数字调制方式使功率放大器的射频输入信号表现出高带宽和"非恒定包络"的特点,如果功率放大器仍采用传统的恒定电压供电,则将产生较大的功率损耗。因此,为提高其工作效率,高速电压随动电源的应用是发展趋势。本文阐述了高速电压随动电源的概念和应用背景,对现有包络线跟踪变换器的电路系统结构进行分类和归纳总结,指出各结构的优势、适用场合和直接应用于高速电压随动电源时的不足。最后,文章指出合理的系统架构、高频高效驱动电路的设计以及对寄生参数效应的考虑是高速电压随动电源的设计所面临的主要挑战。

In 3G communication system,the input radio frequency signal to the power amplifier characterizes of high bandwidth and non-constant envelope.Under this condition,constant amplitude power supply to the power amplifier will lead to significant power loss.Therefore,in order to enhance efficient operation,high speed envelope tracking power supply will be used in the future.In this paper,the concept and application backgrounds of high speed envelope tracking power supply are introduced.Meanwhile based on the classification and generalization of all the existent schemes,the advantages,application areas and the shortages when directly used in high speed envelope tracking occasions are discussed.Finally,it is pointed out that the proper system structure,the design of high frequency and high efficiency driving circuit,and the considerations on parasitic effects are the most important challenges in the proposed area.