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Portable RDFT-Based EIS System Design With a Low-Complexity Impedance Calculation
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DOI：10.1109/TIM.2023.3277929.png)
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摘要
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This article presents a novel low-complexity impedance calculation based on a compact recursive discrete Fourier transform (RDFT) for electrical impedance spectroscopy (EIS) system design. Compared to a traditional fast Fourier transform (FFT), an arbitrary-length RDFT is not limited by the power-of-two transform length. By choosing a suitable integer ratio of the desired frequency/frequency resolution, the spectrum leakage can be significantly reduced by 4-Hz resolution per bin, which enables a lower magnitude relative error (MRE) and a phase absolute error (PAE) in impedance calculations. Here, the practical measurement results show that the maximum MRE and PAE are below 0.1% and 0.5?, respectively, making this approach superior to previously reported ones. Compared with the state-of-the-art Goertzel filter-based EIS system, the proposed method provides more frequency bins (+43.75%) within the same frequency band, and the operations in terms of square root, division, and arctangent are drastically reduced by 50%, 33%, and 50%, respectively. In addition, the proposed system only costs $474 USD and can serve as a suitable solution for various EIS applications in the future.
Keyword:
Impedance
Frequency measurement
Impedance measurement
Discrete Fourier transforms
Computer architecture
System analysis and design
Low-pass filters
Battery performance
biosensor
discrete Fourier transform (DFT)
electrical impedance spectroscopy (EIS)
fast impedance calculation
期刊
IF:
5.9
论文数:
2.0W
被引数:
5.8W
机构
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