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在手持设备中给射频功放供电一直是一个比较难做的设计,因为一方面需要提高射频功放的工作效率用来延长电池的工作时间,另一方面又不能在提高工作效率的同时降低功放的工作性能,所以必须为其提供一个满足要求的高效直流电源。常规的方式,是将功放的电源端与电池直接连接供电,但是这种工作模式会使得功放的工作效率很低,不能满足高效低功耗要求。德州仪器公司推出的SuPA(Supply for Power Amplifier)系列的DC-DC产品,从工作机理上做了创新,采用平均功率跟踪(Average Power Track)技术和包络跟踪技术(Envelop Tracking),优化了射频功放工作时功率消耗,从而提高了功放的工作效率,延长了电池的工作时间。本文着重阐述平均功率跟踪技术的工作原理和SuPA的应用设计,从而方便设计工程师能够快速地理解和应用此项技术,实现高效的功放电源设计。
Powering radio frequency power amplifiers in handsets has always been a harder design because of the need to increase the efficiency of the RF power amplifier to extend the battery’s operating time and to reduce the work of the power amplifier while increasing work efficiency Performance, so we must provide it with a high efficiency DC power supply to meet the requirements. The conventional way is to connect the power terminal of the power amplifier directly with the battery, but this working mode will make the power amplifier work inefficiently and can not meet the requirements of high efficiency and low power consumption. Texas Instruments’ SuPA (Supply for Power Amplifier) family of DC-DC products innovates on a working principle, using Average Power Track and Envelop Tracking to optimize RF Power amplifier work when the power consumption, thereby enhancing the work efficiency of the amplifier, extending the battery’s working hours. This article focuses on the working principle of average power tracking and SuPA application design to facilitate design engineers to quickly understand and apply this technology to achieve efficient power amplifier design.