@inproceedings{ee550b2acdc842a8bb001b7a54c66de5,
title = "A 2.36μW/Ch CMOS 8-Channel EEG Acquisition Unit with Input Protection Circuits for Applications under Transcranial Direct Current Stimulation",
abstract = "A 0.18um-CMOS 8-channel EEG acquisition unit with input protection circuits is designed and fabricated for EEG monitoring under the transcranial direct current stimulation (tDCS). The capacitively-coupled chopper instrumentation amplifier (CCCIA) with chopper modulation is used to suppress flicker noise and amplify input EEG signals. To filter out high frequency noise with high linearity, the switched-capacitor low-pass filter (SC-LPF) is proposed. The switched-capacitor amplifier (SC-Amp) is also proposed to drive ADC capacitor array. The input protection circuit (IPC) is implemented by I/O device to keep internal circuits from overstress and artifacts from the tDCS. A 10-bit SAR ADC with offset-calibration comparator is integrated for accurate ADC conversion. The fabricated EEG acquisition unit has programmable gain 57.5/67.6/78.5dB. The measured power dissipation of a single CCCIA circuit is 2.36μW per channel. The measured recovery time is 7.5ms after the tDCS stimulation. It has been verified that the designed chip can record real EEG signals.",
keywords = "electroencephalogram (EEG), HD-TDCS, input protection, low noise, switched-capacitor",
author = "Chung-Yu Wu and Huang, {Chi Wei} and Tsai, {Tzung Lin}",
year = "2019",
month = oct,
doi = "10.1109/BIOCAS.2019.8919120",
language = "English",
series = "BioCAS 2019 - Biomedical Circuits and Systems Conference, Proceedings",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "BioCAS 2019 - Biomedical Circuits and Systems Conference, Proceedings",
address = "United States",
note = "null ; Conference date: 17-10-2019 Through 19-10-2019",
}