Power supply generation and battery management for energy efficient SDR

Driven by the always increasing feature´s demand of cellular phones, together with the tight constraint of smart power saving, power management (PM) keeps on developing and becoming more complex from one generation to the next. To keep on being competitive at the same time, PM can ´t be considered as a mere isolated/concentrated device anymore but attention must be turned to a smart partitioning. This is specifically true when extending PM concepts towards software defined radio (SDR) chips. In this paper we give an introduction about stand-alone PMU chips, and then describe challenges to cope with when integrating PM features on a complex SoC.