Continuous Time Level Crossing Sampling ADC for Bio-Potential Recording Systems.
Continuous Time Level Crossing Sampling ADC for Bio-Potential Recording Systems.
复制标题
DOI：
10.1109/tcsi.2012.2220464
复制
发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
Culurciello E
中科院分区：
文献类型：
--
作者：
Tang W;Osman A;Kim D;Goldstein B;Huang C;Martini B;Pieribone VA;Culurciello E
本文提出了一种用于生物电位记录传感器的固定窗电平交叉采样模数转换器。这是第一个提出并完全实现的无本地DAC和时钟的固定窗电平交叉ADC。该电路旨在减小未来无线神经生理传感器系统中的数据大小、功耗和硅片面积。搭建了生物电势信号测试系统，并利用该测试系统对电路性能进行了评估。该生物电势放大器在200赫兹-20千赫的带宽内提供了53分贝的增益。输入参考均方根噪声为2.8µV。在异步电平交叉ADC中，最小增量分辨率为4 mV。该ADC的输入信号频率最高可达5 kHz。该系统采用AMI0.5uMCMOS工艺制作。芯片尺寸为1.5 mm×1.5 mm。在3.3V电源下，4通道系统的静态功耗为118.8微瓦，在240 kS/S采样率下为501.6微瓦。转换效率为1.6 nJ/转换。
In this paper we present a fixed window level crossing sampling analog to digital convertor for bio-potential recording sensors. This is the first proposed and fully implemented fixed window level crossing ADC without local DACs and clocks. The circuit is designed to reduce data size, power, and silicon area in future wireless neurophysiological sensor systems. We built a testing system to measure bio-potential signals and used it to evaluate the performance of the circuit. The bio-potential amplifier offers a gain of 53 dB within a bandwidth of 200 Hz-20 kHz. The input-referred rms noise is 2.8 µV. In the asynchronous level crossing ADC, the minimum delta resolution is 4 mV. The input signal frequency of the ADC is up to 5 kHz. The system was fabricated using the AMI 0.5 µm CMOS process. The chip size is 1.5 mm by 1.5 mm. The power consumption of the 4-channel system from a 3.3 V supply is 118.8 µW in the static state and 501.6 µW with a 240 kS/s sampling rate. The conversion efficiency is 1.6 nJ/conversion.