与增强的Howland电路相比,开关的CMOS电源用于生物阻抗应用
Pablo Dutra da Silva1, Pedro Bertemes Filho1
1Electrical Engineering Department, State University of Santa Catarina, Mexico, Brazil.
Journal of electrical bioimpedance
|October 7, 2024
概括
新的切换CMOS电流源 (SCMOSCS) 与增强的豪兰电流源 (EHCS) 相比,在可穿戴设备中提供了优越的生物阻抗分析 (BIS) 性能. 这项创新使得用于疾病诊断的组织分析更加准确和高效.
科学领域:
- 生物医学工程 生物医学工程
- 电气工程 电气工程
- 可穿戴技术可穿戴技术
背景情况:
- 生物阻抗光谱 (BIS) 对于疾病诊断和组织分析至关重要.
- 可穿戴医疗设备需要小型化,低功耗的CMOS集成电路来进行生物阻抗分析.
- 现有的电流源,如增强的豪兰电流源 (EHCS),在宽带信号和功率效率方面存在局限性.
研究的目的:
- 为了评估新的交换CMOS电流源 (SCMOSCS) 与BIS应用的EHCS的性能.
- 评估SCMOSCS适用于超低功率,高性能可穿戴生物阻抗分析的适用性.
- 用Cole-skin模型在各种模拟条件下比较当前源的能力.
主要方法:
- 使用了SPICE模拟,包括DC和AC扫描和短暂分析.
- 使用Cole-skin模型作为负载,SCMOSCS的性能与EHCS进行了评估.
- 测量了关键性能指标,如输出阻抗,电压波动,电流消耗和负载能力.
主要成果:
- SCMOSCS实现了超过20MΩ的输出阻抗,从3.3V电源获得±2.5V的输出电压波动,并支持10kΩ负载.
- 与EHCS (4.9 mA) 相比,SCMOSCS的电流消耗显著降低 (275 μA).
- EHCS 显示出有限的 +1.5 V 输出电压波动和 3 kΩ 的负载能力.
结论:
- 在可穿戴设备中,SCMOSCS为生物阻抗分析提供了更兼容和高性能的解决方案,特别是与像DIBS这样的宽带信号.
- 该SCMOSCS设计提供优越的输出电压波动,负载能力和功率效率超过EHCS.
- 这一进步支持下一代,电池驱动的可穿戴医疗保健设备的开发,以加强诊断.
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