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一个可重新配置的三模频率锁定循环读出电路,用于生物传感器接口.

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    一个基于频率锁定循环 (FLL) 的新型集成电路 (IC) 可实现温度,电化学信号和pH的多式传感. 这种低功耗的IC实现了对电阻,电流和电压测量的高分辨率,证明了它对无线传感系统的多功能性.

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    科学领域:

    • 集成电路设计 集成电路设计
    • 传感器接口的接口
    • 无线通信是一种无线通信.

    背景情况:

    • 传统的传感器读取回路通常需要专门的模拟前端组件来进行不同类型的测量.
    • 将多式联通传感能力集成到单一芯片中,对小型化和电力效率构成了挑战.
    • 现有的解决方案可能缺乏灵活性,无法在不经重大重新设计的情况下与各种离芯片传感器接口.

    研究的目的:

    • 提供可重新配置的基于频率锁定循环 (FLL) 的集成电路 (IC),能够进行多模式传感器读取.
    • 为了证明IC能够在没有额外的活跃模拟前端电路的情况下测量电阻,电流和电压.
    • 在各种传感应用中验证原型IC的性能,并评估其功耗和无线传输能力.

    主要方法:

    • 使用0.18微米CMOS工艺制造一个原型IC.
    • 在FLL内部重新配置一个开关电容器反网络,用于不同的测量模式 (电阻,电流,电压).
    • 使用离芯片传感器 (热敏器,pH探针) 和芯片上的电位器,包括无线传输测试,对IC的性能进行表征.

    主要成果:

    • 实现了10.5 Ω (100 Hz带宽) 的输入引用电阻分辨率.
    • 经过证明的温度传感器具有超过0-75°C的16.4mKrms分辨率.
    • 显示的电流传感范围为0.5μA,噪声低至40.6 pArms (100 Hz带宽).
    • 电压模式实现了31.7μVrms的最小噪声和从1.6到12的pH测量.
    • 在所有模式下,在1.2V供电时,功耗低于10μW.
    • 成功演示了一种无线多式传感系统,具有开启关闭 (OOK) 调制.

    结论:

    • 基于FLL的读取IC为多式联接传感提供了多功能和节能的解决方案.
    • 可重新配置的架构消除了对专用模拟前端的需求,简化了系统设计.
    • 展示的无线功能为集成的低功耗传感系统铺平了道路.