Journal
IEEE SOLID-STATE CIRCUITS LETTERS
Volume 3, Issue -, Pages 514-517Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSSC.2020.3036223
Keywords
Capacitance-to-digital converter (CDC); charge reuse; dynamic; Internet of Things (IoT); power gating
Funding
- European Union [665347]
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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 successive approximation register 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 figure of merit as low as 4.3 fJ/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 versus speed with a minimum power of only 44 pW and a compact chip area of 6440 mu m(2).
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