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This letter proposes a near-threshold single-inductor doubleoutput (SIDO) DC-DC converter with a high-precision zero current detector (ZCD) circuit which supply voltage to phase change memory (PCRAM) chip in wireless sensor network. It has a specific startup procedure to provide wide input voltage range. And the ZCD circuit is designed according to volt-second balance theory and minimizes the duration of reverse inductor current to about 1 nS. The DC-DC converter is implemented in 110 nmdoi:10.1587/elex.16.20190250 fatcat:4mrimzcg5zbn5b43qn42ruyeoq