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. 2020 Jan 24;15(1):e0227684. doi: 10.1371/journal.pone.0227684

Fig 3. The MEG system block diagram [14].

Fig 3

PD TIA: the transimpedance amplifier which amplifies the currents from the sensors’ photo diodes; temp. CNTRL: temperature control; ADC: analog-to-digital converter; DAC: digital-to-analog converter; SEF/AEF Stimulation: somatosensory/auditory stimulation; Ref.: 1 kHz reference for the software lock-in amplifier.