2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers 2015
DOI: 10.1109/isscc.2015.7063083
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20.10 A 50nW-to-10mW output power tri-mode digital buck converter with self-tracking zero current detection for photovoltaic energy harvesting

Abstract: Photovoltaic energy harvesting is an attractive method of developing battery-free systems for wireless sensors, biomedical electronics, and the internet of things (IoT). To obtain an energy-efficient system, low-power digital circuits operating in the near/sub-threshold region are widely used in such applications. Therefore, the design of a low-voltage buck converter, which converts the harvested energy to the regulated output is critical. Sub-1V buck converters have been implemented using a large inductor [1]… Show more

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Cited by 28 publications
(14 citation statements)
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“…Table 3 summarizes the key performance of the proposed converter compared with the state‐of‐the‐art. It can be clearly drawn from the above table that this work achieves 300,000× load range which is the widest expected for [24], where the 0.35 to 0.5‐V output voltage is not suitable for powering BLE or other radio modules. The proposed converter also achieves comparable load range, power efficiency, and quiescent current with the state‐of‐the‐art.…”
Section: Resultsmentioning
confidence: 85%
See 2 more Smart Citations
“…Table 3 summarizes the key performance of the proposed converter compared with the state‐of‐the‐art. It can be clearly drawn from the above table that this work achieves 300,000× load range which is the widest expected for [24], where the 0.35 to 0.5‐V output voltage is not suitable for powering BLE or other radio modules. The proposed converter also achieves comparable load range, power efficiency, and quiescent current with the state‐of‐the‐art.…”
Section: Resultsmentioning
confidence: 85%
“…When the input voltage is 3 V, the necessary modules are retained, and the quiescent current is only 780 nA and the total I Q variation is less than 20 nA in overall V IN range. range which is the widest expected for [24], where the 0.35 to 0.5-V output voltage is not suitable for powering BLE or other radio modules. The proposed converter also achieves comparable load range, power efficiency, and quiescent current with the state-of-the-art.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…In summary, MPPT has a more macro definition. Once the MPPT controller is put into the power management system for analysis, it can track the maximum power point, maximum voltage point, or maximum current point [ 20 , 21 ].…”
Section: System Design and Analysismentioning
confidence: 99%
“…Even though the absolute power levels are low, a power range of µW's in smart nodes up to mW's for auxiliary standby units spans three orders of magnitude. Realization of such a wide operation range is not an simple feature to accomplish [vL13] and typically involves multiple control parameters to vary or multiple operation modes [Che15], where normally one is enough. Inevitably, when an application is on the low end of this power spectrum, the power converter is operating at a very light loading condition, and is not fully taking advantage of its die area and is operating at a low actual power density in comparison to its nominal capability.…”
Section: Target Functionality and Specificationmentioning
confidence: 99%