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相关概念视频

Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...

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Single-unit In vivo Recordings from the Optic Chiasm of Rat
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一个低噪音低功率0.001Hz-1kHz神经记录系统在芯片上的样本级任务循环.

Jiajia Wu, Abraham Akinin, Jonathan Somayajulu

    IEEE transactions on biomedical circuits and systems
    |February 26, 2024
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    概括

    一个新的16通道神经记录系统在芯片 (SoC) 允许精确的,宽带生物潜能信号检测可穿戴医疗设备. 它在广泛的频率范围内实现了超低噪声和高阻抗,改善了电生理学应用.

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    科学领域:

    • 生物医学工程 生物医学工程
    • 集成电路设计 集成电路设计
    • 电子生理学 电子生理学

    背景情况:

    • 大脑机器接口和可穿戴传感器的进步需要精确的电生理学来处理各种生物潜能信号 (mHz到kHz).
    • 目前的可穿戴解决方案在检测范围和准确性方面面临限制,原因是带宽,噪声,输入阻抗和功耗的权衡.

    研究的目的:

    • 介绍一款新的16通道宽带,超低噪音神经记录系统芯片 (SoC),用于移动医疗保健的慢性使用.
    • 为了实现高准确度的生物潜能记录在广泛的频谱,从电胃图 (EGG) 到电神经图 (ENG).

    主要方法:

    • 用65nmCMOS技术制造一个16通道的SoC.
    • 每个通道的实现使用一个delta-sigma模拟到数字转换器 (ADC).
    • 包括一个样本级工作循环 (SLDC) 模式来实现0.001 Hz到1 kHz的带宽.

    主要成果:

    • 在连续模式下,通过1Hz-1kHz带宽实现1.0μVrms输入引用噪声,噪声效率因子 (NEF) 为2.93.
    • 在SLDC模式下,保持了超低噪声 (1.1μVrms超过0.001Hz-1Hz) 并实现了435 MΩ的输入阻抗.
    • 在人类受试者中,通过脑电图 (EEG) 和胃电图 (EGG) 的记录验证了功能.

    结论:

    • 拟议的SoC为可穿戴生物潜能监测提供了重大进展,克服了现有技术的局限性.
    • 宽带宽,超低噪声和高输入阻抗使其适用于慢性移动医疗保健应用,包括大脑和消化系统监测.