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在SAR ADC中用于生物传感器应用的混合节能,面积高效,低复杂的开关方案

Yunfeng Hu¹, Chaoyi Chen¹, Qingming Huang¹

¹Zhongshan Institute, University of Electronic Science and Technology of China, Zhongshan 528402, China.

|January 23, 2024

概括

连续近似注册模拟数字转换器 (SAR ADC) 的新型切换方案显著提高了能源效率,并减少了生物传感器应用的面积. 这种混合式方法将开关能量减少98.4%,单元电容减少87.5%.

科学领域:

* 电气工程电气工程
* 集成电路设计 * 集成电路设计
* 生物医学工程 * 生物医学工程

背景情况:

*连续近似注册模拟到数字转换器 (SAR ADC) 对于生物传感器数据采集至关重要.
*现有的SAR ADC在能源效率和电路面积方面面临挑战,这限制了它们在低功耗生物传感中的应用.
*SAR ADC中的传统开关方案往往导致高功耗和大型电容器阵列.

研究的目的:

*为SAR ADCs提出混合开关方案,以优化能源效率和面积利用.
*为了提高SAR ADC的性能,特别用于生物传感器应用.
* 为了减少SAR ADC中驱动电路设计的复杂性.

主要方法:

* 一种混合开关方案,结合了单调技术,MSB电容分离和一种新的开关方法.
*利用参考电压V_aq进行灵活的参考电压转换,从而节省面积和能源.
* 在大多数比较中,在电容器阵列中实现单边切换,简化了电路设计.
* 集成低噪音的动态比较器,基于启动的低采样误差开关和动态SAR逻辑.

主要成果:

* 与传统方案相比,实现了98.4%的切换能源的减少.
*将单元电容数量减少了87.5%.
* 证明信号对噪声扭曲比 (SNDR) 为61.51dB,虚无动态范围 (SFDR) 为79.21dB.
* 在180nm过程中,在100kS/s的采样速率下,在1V供应下达到0.278μW的超低功耗.

结论:

* 拟议的混合切换方案为SAR ADCs提供了显著的能源效率改善和面积减少.
*开发的SAR ADC非常适合用于功率受限制的生物传感器应用.
*设计表明了性能指标和功率/面积效率之间的令人信服的权衡.

关键词:

这就是为什么SAR SAR SAR.区域效率区域效率区域效率电容器分裂电容器分裂能源效率是指能效的能源效率.低复杂性的低复杂性一个单调的单调的单调.

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