標題: | A 2.36 mu W/Ch CMOS 8-Channel EEG Acquisition Unit with Input Protection Circuits for Applications Under Transcranial Direct Current Stimulation |
作者: | Wu, Chung-Yu Huang, Chi-Wei Tsai, Tzung-Lin 電子工程學系及電子研究所 Department of Electronics Engineering and Institute of Electronics |
關鍵字: | low noise;input protection;switched-capacitor;HD-tDCS;electroencephalogram (EEG) |
公開日期: | 1-Jan-2019 |
摘要: | 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 switchedcapacitor 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 2.36 mu W 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. |
URI: | http://hdl.handle.net/11536/154038 |
ISBN: | 978-1-5090-0617-5 |
ISSN: | 2163-4025 |
期刊: | 2019 IEEE BIOMEDICAL CIRCUITS AND SYSTEMS CONFERENCE (BIOCAS 2019) |
起始頁: | 0 |
結束頁: | 0 |
Appears in Collections: | Conferences Paper |