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Sub-1-V Power-Supply System with Variable-Stage SC-Type DC-DC Converter Scheme for Ambient Energy Sources

This paper describes a sub-1-V power-supply, which is useful for self-powered short-range wireless systems with ambient energy sources. A variable-stage DC-DC converter, which consists of multi-stage switched capacitor circuits and has intermittent operation with an external capacitor, makes it possible to extend the time for self-powered operation. We fabricated a variable-stage DC-DC converter and an intermittent operation circuit with a 0.8-μm CMOS/SOI process. We also applied the sub-1-V power-supply system to a self-powered short-range wireless system and verified its effectiveness.