Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 50, Issue 11, Pages 2501-2512Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2015.2464705
Keywords
Complex impedance; electrical impedance tomography (EIT); lung ventilation monitoring; planar-fashionable circuit board (P-FCB); real-time imaging
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Funding
- Korean Health Technology R&D Project through the Ministry of Health and Welfare [HI14C0743]
- Korea Health Promotion Institute [HI14C0743010015] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An electrical impedance tomography (EIT) SoC is proposed for the portable real-time lung ventilation monitoring system. The proposed EIT SoC is integrated into belt-typefabric system with 32 electrodes and can show the dynamic images of the lung ventilation on the mobile devices. To get high fidelity images, a T-switch is adopted for high off-isolation between electrodes more than 60 dB, and I/Q signal generation and demodulation can obtain both real and imaginary part of images. For the real-time imaging, an on-chip fast demodulation scheme is proposed, and it can also reduce speed requirements of ADC for low-power consumption. The proposed EIT SoC of 5.0 mm x 5.0 mm is fabricated in 0.18 mu m CMOS technology, and consumes only 10.4 mW with 1.8 V supply. As a result, EIT images were reconstructed with 97.3% of accuracy and up to 20 frames/s real-time lung images can be displayed on the mobile devices.
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