一个10通道,120nW/通道,可重新配置的电容到数字转换器,用于小于μW的强大的可穿戴传感器
IEEE transactions on biomedical circuits and systems
|July 1, 2024
概括
本研究介绍了一种用于可穿戴传感器的低功耗,10通道可重新配置的电容到数字转换器 (CDC). 它实现了超低功耗,使得高效的亚微瓦特传感应用成为可能.
科学领域:
- 集成电路 集成电路
- 传感器技术 传感器技术
- 可穿戴电子设备的电子产品
背景情况:
- 可穿戴式传感应用需要低功耗,高性能模拟数字转换器 (ADC).
- 现有的电容数字转换器 (CDC) 经常面临电力消耗和适应各种传感需求的挑战.
研究的目的:
- 为可穿戴应用开发可重新配置,多通道的CDC,具有超低功耗.
- 通过重新配置,实现适应式传感能力,包括范围和速度.
- 通过结合寄生虫校正和基线校准来提高测量准确性.
主要方法:
- 设计了一个10通道,共享的6位差分ADC架构.
- 使用了基于电容分隔器的方法,避免了耗电的运行式跨阻抗放大器.
- 在/离芯片寄生纠正和基线校准被实施来测量电容变化 (ΔC).
- 包括可编程通道访问,随机中断保护和通道监控逻辑.
主要成果:
- 开发的CDC在1.6kHz采样频率下实现了1.2μW的总功耗,与之前的工作相比减少了8.6倍.
- 测量的 ΔC 范围为 5.34 pF (1倍灵敏度) 和 1.8 pF (3倍灵敏度).
- 通过气体染色学 (GC) 中的二甲基-甲基酸盐 (DMMP) 气体传感器成功测试了10通道的CDC.
- 该设计采用了65纳米CMOS工艺实现,占用了0.251mm2的活性面积.
结论:
- 拟议的可重新配置的CDC显著降低了可穿戴传感器的功耗.
- 适应式传感能力和测量精度使其适用于各种应用,包括气体传感.
- 这项工作展示了下一代低功耗可穿戴电子系统的有希望的解决方案.
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