Impedance spectroscopy systems: Review and an all-digital adaptive IIR filtering approach
Impedance spectroscopy systems: Review and an all-digital adaptive IIR filtering approach
复制标题
阻抗谱系统：回顾和全数字自适应 IIR 滤波方法
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Rusu
中科院分区：
文献类型：
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作者：
N. Ivanisevic;S. Rodriguez;A. Rusu
阻抗谱是一种低成本的传感技术，由于它可以有效地集成在单个微芯片上，因此在可穿戴和植入式生物医学应用中引起了人们极大的兴趣。在本文中，最知名的系统架构的基本特征，并提出了一个更强大和硬件效率的解决方案。基于自适应滤波的全数字实现用于识别被测样品的阻抗参数。无限冲激响应（IIR）滤波器的系数由基于伪线性回归和输出误差公式的自适应算法来调整。一个三电平伪随机噪声发生器与凹功率谱密度，而不恶化的标称性能。概念验证已经过行为模拟验证。
Impedance spectroscopy is a low-cost sensing technique that is generating considerable interest in wearable and implantable biomedical applications since it can be efficiently integrated on a single microchip. In this paper, the fundamental characteristics of the most well-known system architectures are presented, and a more robust and hardware-efficient solution is proposed. An all-digital implementation based on adaptive filtering is used for identifying the impedance parameters of a sample-under-test. The coefficients of an infinite-impulse-response (IIR) filter are tuned by an adaptive algorithm based on pseudo-linear regression and output-error formulation. A three-level pseudorandom noise generator with a concave power spectral density is employed without deteriorating the nominal performance. Proof-of-concept has been verified with behavioral simulations.