An 89.3% Current Efficiency, Sub 0.1% THD Current Driver for Electrical Impedance Tomography

An 89.3% Current Efficiency, Sub 0.1% THD Current Driver for Electrical Impedance Tomography
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An%2089.3%%20Current%20效率,%20Sub%200.1%%20THD%20Current%20Driver%20for%20Electrical%20Impedance%20断层扫描

DOI:
10.1109/tcsii.2023.3294753
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发表时间:
2023
期刊:
Express Briefs
影响因子:
--
通讯作者:
Li J
Li J
中科院分区:
--
文献类型:
--
作者:
Li J

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精确的电阻抗断层成像(EIT)测量需要具有低总谐波失真(THD)和高输出阻抗的电流驱动器。传统的EIT电流驱动器获得这些参数的良好性能,但以低电流效率为代价。本文介绍了一种基于隔离共模反馈的电流反馈结构的差分电流驱动器,它具有极低的THD、高输出阻抗和高电流效率。此外,它还使用电流DAC消除输出节点上的任何直流失调。电流驱动器采用65 nm CMOS工艺制造,电源电压为3.3 V。测量结果表明,在80 kHz时,对于和输出电流,THD分别为0.05%和0.1%。总电流消耗为1.54 mA,最大电流效率为89.3%。在500 kHz和1 MHz下测得的输出阻抗分别为1.023和568。
Accurate electrical impedance tomography (EIT) measurements require a current driver with low total harmonic distortion (THD) and high output impedance. Conventional EIT current drivers attain good performance for these parameters but at the expense of low current efficiency. This Brief presents a differential current driver based on a current feedback structure with isolated common-mode feedback, achieving very low THD, high output impedance and high current efficiency. In addition, it uses current DACs to remove any dc offsets at the output nodes. The current driver was fabricated in a 65-nm CMOS technology with 3.3 V supply. Measured results demonstrate a THD of 0.05% and 0.1% at 80 kHz, forandoutput current, respectively. The total current consumption is 1.54 mA, resulting in a maximum current efficiency of 89.3%. The measured output impedance is 1.023at 500 kHz and 568at 1 MHz.
适用于 EIT 应用的具有分立共模反馈的低功耗、低 THD 电流驱动器
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