A Compact Fully Dynamic Capacitance-to-Digital Converter with Energy-Efficient Charge Reuse

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Samenvatting

An ultra-low power fully dynamic capacitance-to-digital converter (CDC) that exploits a novel charge reuse technique is proposed. The CDC includes a capacitive bridge as the sensing frontend and an asynchronous SAR ADC for signal digitization. Passive charge sharing between the frontend and ADC is used to enable a fully dynamic operation. Instead of resetting the capacitive bridge (with large sensing and reference capacitors) for each measurement, the charge is maintained and reused over many measurements to save energy. A power gating technique is employed to reduce the stand-by power. As a result, a FoM as low as 4.3fJ/conv-step is achieved for the CDC, which is >3x better than the state-of-the-art. Furthermore, it supports an inherent scaling of power vs. speed with a minimum power of only 44pW and a compact chip area of 6440μm2.

Originele taal-2Engels
Artikelnummer9249050
Pagina's (van-tot)514-517
Aantal pagina's4
TijdschriftIEEE Solid-State Circuits Letters
Volume3
DOI's
StatusGepubliceerd - 5 nov 2020

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