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首页> 外文期刊>IEEE transactions on biomedical circuits and systems >A Piezo-Powered Floating-Gate Sensor Array for Long-Term Fatigue Monitoring in Biomechanical Implants
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A Piezo-Powered Floating-Gate Sensor Array for Long-Term Fatigue Monitoring in Biomechanical Implants

机译：压电驱动的浮栅传感器阵列，用于生物力学植入物中的长期疲劳监测

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摘要

Measurement of the cumulative loading statistics experienced by an implant is essential for prediction of long-term fatigue failure. However, the total power that can be harvested using typical in-vivo strain levels is less than 1 muW. In this paper, we present a novel method for long-term, battery-less fatigue monitoring by integrating piezoelectric transduction with hot-electron injection on a floating-gate transistor array. Measured results from a fabricated prototype in a 0.5-mum CMOS process demonstrate that the array can sense, compute, and store loading statistics for over 70000 stress-strain cycles which can be extended to beyond 107 cycles. The measured response also shows excellent agreement with a theoretical model and the nominal power dissipation of the array has been measured to be less than 800 nW.
机译：植入物经历的累积载荷统计数据的测量对于预测长期疲劳失效至关重要。但是，使用典型的体内菌株水平可以收获的总功率小于1μW。在本文中，我们提出了一种通过在浮栅晶体管阵列上集成压电换能与热电子注入相结合的长期无电池疲劳监测的新方法。用0.5微米CMOS工艺制造的原型的测量结果表明，该阵列可以感应，计算和存储超过70000个应力-应变循环的载荷统计数据，可以扩展到超过107个循环。测得的响应也显示出与理论模型的极佳一致性，并且该阵列的标称功耗已测量为小于800 nW。

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