Charge-pumping with finger capacitance in a custom electrostatic energy harvesting ASIC

We present an integrated circuit capable of scavenging energy from repetitive changes in finger touch capacitance. A finger tapping on this application-specific integrated circuit generates a capacitive change of approximately 770 pF. This change feeds into a charge-pump circuit that stores 320 pJ o...

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Veröffentlicht in:Applied physics letters 2020-07, Vol.117 (3)
Hauptverfasser: Zhou, A. Y., Maharbiz, M. M.
Format: Artikel
Sprache:eng
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Zusammenfassung:We present an integrated circuit capable of scavenging energy from repetitive changes in finger touch capacitance. A finger tapping on this application-specific integrated circuit generates a capacitive change of approximately 770 pF. This change feeds into a charge-pump circuit that stores 320 pJ of energy on a 1 nF storage capacitor. We present measurement results and simulations that demonstrate operation. As a proof-of-concept, we also demonstrate that the harvested energy can power a ring oscillator that outputs a series of chirps with frequencies ranging from 80 Hz to 30 kHz as the storage capacitor voltage charges and discharges.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0014008