Fig. 2: Retrieving low-frequency voltage signals applied on the sensing electrodes.
From: WISDEM: a hybrid wireless integrated sensing detector for simultaneous EEG and MRI
a, The schematic setup to characterize the frequency response of the WISDEM detector when a train of sinusoidal waves were directly injected into the sensing electrode and the ground reference. b, The sinusoidal waveform was reconstructed by derivatizing the phase of oscillation signal and dividing this phase derivative with the FVR, that is, \(({{\mathrm{d}}\varnothing }_{t}/{{\mathrm{d}}t})\)/FVR. c, Zoom-in view of five epochs (20 sinusoidal pulses each). Stacked waveforms (light gray, n = 5) closely matched the simulated input (blue), with the averaged profile (red) showing in high agreement (insert at the bottom left of the figure). d, Top: bar plots showing the distribution of reconstructed peak intensities for each applied voltage (mean ± s.d., n = 100 waveforms). Bottom: box and whisker plots summarizing the same distribution of peak intensities: where whiskers denote the minimum and maximum, and boxes show the mean (center line) and interquartile range.
