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A flexible ECG patch compatible with NFC RF communication
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DOI：10.1038/s41528-020-0077-x.png)
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摘要
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With the advent of the internet of things, flexible wearable devices are gaining significant research interest, as they are unobtrusive, comfortable to wear and can support continuous observation of physiological signals, helping to monitor wellness or diagnose diseases. Amorphous Indium Gallium Zinc Oxide (a-IGZO) Thin Film Transistors (TFTs) fabricated on flexible substrates are an attractive option to build such bio-signal monitoring systems due to their flexibility, conformability to the human body, and low cost. This paper presents a flexible electrocardiogram (ECG) patch implemented on foil with self-aligned IGZO TFTs, which is capable to acquire the ECG signals, amplify them and convert them to a sequence of bits. The analogue frontend has a measured input-referred noise of 8 mu V-rms in the 1-100Hz band. The system achieves experimentally 67.4dB CMRR, 58.9dB PSRR, and 16.5M Omega input impedance at 50Hz while using 1kHz chopping. The signal from the electrodes is transformed to a 105.9-kb/s Manchester-encoded serial bit stream which could be sent wirelessly to a smart phone via Near Field Communication (NFC) for further elaboration. Power consumption is 15.4mW for the digital and 280 mu W for the analogue part. This contribution shows the fundamental steps to demonstrate intelligent plasters for biomedical applications based on flexible electronics providing an NFC-compatible digital output bit stream.
Keyword:
THIN-FILM TRANSISTORS
ELECTRONICS
FABRICATION
AMPLIFIER
CIRCUITS
SENSORS
SKIN
SOFT
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