Evaluation of single-bit sigma-delta modulator DAC for electrical impedance spectroscopy
Evaluation of single-bit sigma-delta modulator DAC for electrical impedance spectroscopy
复制标题
用于电阻抗谱的单比特 Σ-Δ 调制器 DAC 评估
DOI：
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发表时间：
2017
期刊：
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通讯作者：
M. Ortmanns
中科院分区：
文献类型：
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作者：
M. Rajabzadeh;J. Becker;M. Ortmanns
在本文中，单比特Σ-Δ调制器为基础的数字模拟转换（DAC）的多通道电阻抗谱（EIS）阵列的潜在驱动器进行评估。典型频率范围为几Hz至几MHz的正弦激励是一项具有挑战性的任务，只有极少数最先进的实现能够在片上实现，其中相应的DAC消耗大量的面积和功率。Σ-Δ调制器提供具有1位表示的信号生成，其可以有利地被多路复用、分布并在开关上使用以生成模拟输出;因此其使用可以潜在地降低面积和功耗。本文研究了使用单位Σ-Δ DAC作为直接驱动器的EIS实验。实验分析和讨论了该系统的性能和局限性。微电极的EIS实验可以在20 Hz至1 MHz的范围内成功地进行，并与参考测量匹配，精度优于95%。
In this paper, single-bit sigma-delta modulator based digital-analog conversion (DAC) is evaluated as potential driver in multichannel electrical impedance spectroscopy (EIS) arrays. The sinusoidal excitation with typical frequency range of a few Hz to a few MHz is a challenging task, which only very few state of the art implementations are even able to realize on chip, where the corresponding DAC consumes major amounts of area and power. Sigma-delta modulators offer signal generation with 1-bit representation, which could be advantageously multiplexed, distributed, and used on switches to generate analog output; thus its use could potentially lower the area and power consumption. This paper investigates the use of a single-bit sigma-delta DAC as direct driver for EIS experiments. Performances and limitations of the proposed system are experimentally analyzed and discussed. EIS experiments of micro-electrodes could be successfully conducted in a range from 20 Hz to 1 MHz and matched with reference measurements to better than 95 % accuracy.