Hong Yan, Goh Wang Ling, Wang Yong
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore.
Rev Sci Instrum. 2017 Aug;88(8):086106. doi: 10.1063/1.4997726.
This paper presents an equivalent circuit model for the electrode-electrolyte interface and aims at improving the modeling accuracy of the parasitic effects at frequencies up to 300 MHz. Different from the conventional model, the electrode inductances, body loss capacitances, and body loss resistances are all included in the proposed hybrid-π model. In addition, the S-parameters obtained by a vector network analyzer are innovatively used to extract the parameters of the electrode-electrolyte interface model for a frequency range from 10 Hz to 300 MHz. Since reactance is proportional to frequency, the proposed technique can precisely calculate the parasitic effects at higher frequencies. Verified by experiments, the hybrid-π model presents better accuracies when fitted to both the phases and magnitudes of S11 and S21. The superb modeling accuracy of this work is beneficial for biomedical applications that have an electrode-electrolyte interface.
本文提出了一种电极 - 电解质界面的等效电路模型，旨在提高高达300 MHz频率下寄生效应的建模精度。与传统模型不同，所提出的混合π模型包含了电极电感、体损耗电容和体损耗电阻。此外，创新性地使用矢量网络分析仪获得的S参数来提取10 Hz至300 MHz频率范围内电极 - 电解质界面模型的参数。由于电抗与频率成正比，所提出的技术能够精确计算更高频率下的寄生效应。经实验验证，混合π模型在拟合S11和S21的相位和幅度时具有更好的精度。这项工作的高超建模精度有利于具有电极 - 电解质界面的生物医学应用。
