A 0.8-V 82.9- \mu W In-Ear BCI Controller IC With 8.8 PEF EEG Instrumentation Amplifier and Wireless BAN Transceiver

• Published in: IEEE journal of solid-state circuits Vol. 54; no. 4; pp. 1185 - 1195
• Main Authors: Lee, Jaehyuk, Lee, Kyoung-Rog, Ha, Unsoo, Kim, Ji-Hoon, Lee, Kwonjoon, Gweon, Surin, Jang, Jaeeun, Yoo, Hoi-Jun
• Format: Journal Article
• Language: English
• Published: IEEE 01.04.2019
• Subjects: Auditory steady-state response (ASSR); body channel communication (BCC); brain–computer interface (BCI); current reusing; DSL; Ear; ear electroencephalography (EEG); EEG; electrode dc offset (EDO); Electrodes; Electroencephalography; Gain; instrumentation amplifier (IA); Integrated circuits; operational transconductance amplifier (OTA); Transistors
• ISSN: 0018-9200; 1558-173X
• DOI: 10.1109/JSSC.2018.2888845

In-ear brain-computer interface (BCI) controller system is implemented with a dedicated system-on-chip (SoC) including electroencephalography (EEG) readout and body channel communication (BCC) transceiver (TRX). The 8-mm 2 chip is fabricated using 65-nm CMOS and contains three key features: 1) current reusing low-noise amplifier (CRLNA) for low power; 2) bootstrapping dc servo loop (BDSL) enabling low-noise measurement even on 350-mV electrode dc offset (EDO); and 3) dual-mode programmable gain amplifier (DMPGA) that reduces TRX power consumption by activating only when the intentional blink is present. EEG instrumentation amplifier (IA) shows the state-of-the-art 8.8 power efficiency factor (PEF) performance, and the entire integrated circuit (IC) consumes 82.9 <inline-formula> <tex-math notation="LaTeX">\mu \text{W} </tex-math></inline-formula>. From the measurement, with nine subjects, the proposed BCI system accomplished 84% average accuracy for the binary selection task.