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一个9.68nW 57.51dB的SNDR SAR ADC与双绕道窗口基于生物医学应用的非二进制分割电容器
IEEE transactions on biomedical circuits and systems
|April 2, 2025
概括
本研究介绍了一种使用双绕道窗口的新型低功耗连续近似注册 (SAR) 模拟到数字转换器 (ADC). 这种设计大大降低了生物医学信号采集的功耗,实现了超低功耗.
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:
- 传统的模拟数字转换器 (ADC) 在实现超低功耗方面经常面临挑战,特别是在连续生物医学信号监控方面.
- 现有的SAR ADC可能无法最佳地处理生物信号的动态范围,从而导致效率低下的功率使用.
- 在可穿戴和可植入的生物医学设备中,对强大,低功耗的数据采集系统的需求至关重要.
研究的目的:
- 开发一种适用于生物医学应用的新型低功耗连续近似寄存器 (SAR) 模拟到数字转换器 (ADC).
- 通过创新的建筑设计,特别是双绕道窗户和动态比较器,显著降低电力消耗.
- 通过使用现实世界的生物医学信号,如EMG,ECG和EEG来验证拟议的SAR ADC的性能.
主要方法:
- 实施了具有非二进制分割电容器的SAR ADC架构,以创建双绕道窗口.
- 集成一个低功耗的动态CMOS比较器,以最大限度地减少电压变化和减少功率.
- 利用数字控制电路,基于信号特征进行基于转换周期的可靠和无校准的管理.
主要成果:
- 在0.6V供电电压和5.21kS/s采样速率下,实现了9.68nW的超低功耗.
- 具有57.51dB的信号噪声和扭曲比率 (SNDR),71.68dB的无冲动动态范围 (SFDR) 和9.26位的有效位数 (ENOB) 的高性能.
- 获得了2.9 fJ/转换步骤的优秀沃尔登价值图 (FoM),表明了高能效.
- 经过验证的EMG,ECG和EEG信号的功能,显示EMG量化平均功耗低至7.95nW.
结论:
- 拟议的双绕道窗 SAR ADC 与传统设计相比,可显著降低功耗.
- 该架构强大,无校准,非常适合能源有限的生物医学监测应用.
- 这种设计为开发下一代低功耗可穿戴和可植入的健康监测系统提供了一个引人注目的解决方案.
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