Skip to main content
. Author manuscript; available in PMC: 2018 May 18.
Published in final edited form as: IEEE Biomed Circuits Syst Conf. 2018 Mar 29;2017:1–4. doi: 10.1109/BIOCAS.2017.8325216

Figure 3. Electrode impedance and effect on signal attenuation.

Figure 3

a) Equivalent-circuit model of a metal microelectrode for electrophysiology recordings as adapted from Robinson (1968). Figures (b, c) show the attenuation of the recorded signal through bright Pt and Pt-black electrodes for different electrode sizes. The amplifier input capacitance was taken as 3.8 pF based on measurements, and the shunt capacitance was swept between 0.1 pF to 10 pF as shown in the figures. The measured signal attenuation due to electrode size/impedance is shown for 4 electrode sizes. Blue lines represent bright Pt electrodes, and black lines represent the Pt-black electrodes.