一个低功率SAR ADC,具有电容器分割能效切换方案,用于可穿戴生物传感器应用
Yunfeng Hu1, Qingming Huang1, Bin Tang1
1Zhongshan Institute, University of Electronic Science and Technology of China, Zhongshan 528402, China.
Micromachines
|December 23, 2023
概括
本研究介绍了一种用于可穿戴生物传感器的低功耗连续近似 (SAR) 模拟到数字转换器 (ADC). 它的新型切换方案显著降低了能源消耗,提高了便携式健康监测设备的效率.
科学领域:
- 电气工程 电气工程
- 生物医学工程 生物医学工程
- 集成电路设计 集成电路设计
背景情况:
- 可穿戴生物传感器需要低功耗的模拟数字转换器 (ADC) 才能高效运行.
- 传统的SAR ADC面临着切换能耗和依赖参考电压准确性的挑战.
- 现有的设计通常涉及复杂的数字控制和驱动电路.
研究的目的:
- 为 SAR ADC 提供一种针对可穿戴生物传感器应用的新,节能的切换方案.
- 为了减少开关能耗,并尽量减少对常态电压 (Vcm) 精度的依赖.
- 为了提高整体性能并简化便携式设备SAR ADC的设计.
主要方法:
- 实施一个电容分离的高能效切换方案.
- 整合额外的参考电压 (Vcm) 和常态技术.
- 使用具有多时钟控制的低噪音动态比较器.
- 采用低采样错误开关与引导技术和动态SAR逻辑.
主要成果:
- 与传统方案相比,实现了93.76%的切换能源的减少.
- 显示了61.77dB的信号对噪声和扭曲比 (SNDR) 和78.06dB的无假动态范围 (SFDR).
- 在200kS/s的采样速率下,仅消耗4.45μW的功率.
结论:
- 拟议的电容分裂开关方案显著提高了SAR ADCs的能源效率.
- 该设计可减少对Vcm精度的依赖,并简化数字控制逻辑.
- 开发的SAR ADC非常适合用于低功耗,高性能可穿戴生物传感器应用.
相关概念视频
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