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 μV_rms in the 1–100 Hz band. The system achieves experimentally 67.4 dB CMRR, 58.9 dB PSRR, and 16.5 MΩ input impedance at 50 Hz while using 1 kHz 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 15.4 mW for the digital and 280 μW 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.

随着物联网的出现，柔性可穿戴设备不引人注目，佩戴舒适并且可以支持对生理信号的连续观察，从而有助于监测健康状况或诊断疾病，因此受到了广泛的研究兴趣。在柔性基板上制造的非晶铟镓锌氧化物（a-IGZO）薄膜晶体管（TFT）由于具有灵活性，对人体的适应性和低成本而成为构建此类生物信号监测系统的有吸引力的选择。本文提出了一种在具有自对准IGZO TFT的箔片上实现的柔性心电图（ECG）贴片，该贴片能够获取ECG信号，对其进行放大并将其转换为位序列。模拟前端具有测量的输入参考噪声的8个μV_均方根在1–100 Hz频带中。在使用1 kHz斩波时，该系统在50 Hz时可达到67.4 dB CMRR，58.9 dB PSRR和16.5MΩ输入阻抗的实验值。来自电极的信号被转换为105.9-kb / s曼彻斯特编码的串行位流，该流可以通过近场通信（NFC）无线发送到智能手机，以进行进一步的详细说明。数字部分的功耗为15.4 mW，模拟部分的功耗为280μW。此文稿显示了基本步骤，以展示基于柔性电子产品的NFM兼容数字输出位流的生物医学应用智能石膏。