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- W1707202406 abstract "The development of wireless sensor nodes, as well as the rise of the Internet-of-Things, push ahead the research effort in ultra-low-power integrated circuits. Along with the recent development of micro-energy harvesters, it enables energy-autonomous designs. Nevertheless, such energy harvesters do not provide a large power budget. The power management unit (PMU) must thus be designed properly to ensure that the system will not run out of energy. In order to ease the development of such a PMU for energy-autonomous systems, this dissertation answers two questions: · How can we design efficient on-chip DC/DC converters to supply both ultra-low and multi-mode loads? · How can we integrate these converters in a PMU to address the requirements of energy-autonomous systems? Therefore, we first show that switched-capacitor (SC) DC/DC converters are a good candidate to address the power-conversion issue. Then we further answer the first question by developing a practical and systematical sizing methodology for SC DC/DC converters and by proposing specific designs to enable high conversion efficiency through an extremely wide load power range spanning more than three orders of magnitude. The second question is answered in two parts. First, microcontrollers are an important contributor to the total power consumption of energy-autonomous systems. They have large supply voltage guard band to ensure safe operation which increases their power consumption. We propose a PMU that monitors the clock frequency and delivers a supply voltage that is automatically adapted to process corners and temperature fluctuations, reducing the microcontroller voltage guard band and its power consumption by up to 44%. Finally, PMUs for energy-autonomous systems must convert the energy provided by the harvesters, send it to the storage device, and supply the loads. As increasing the number of voltage converters lowers the power conversion efficiency, we propose a complete PMU that only uses one SC DC/DC converter." @default.
- W1707202406 created "2016-06-24" @default.
- W1707202406 creator A5012393335 @default.
- W1707202406 date "2013-01-01" @default.
- W1707202406 modified "2023-09-24" @default.
- W1707202406 title "Switched-capacitor DC/DC converters in nanometer CMOS technologies for micro-power energy management" @default.
- W1707202406 hasPublicationYear "2013" @default.
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