Browsing by Author "Ho, Chia-Shiung"

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An 8-Channel Chopper-Stabilized Analog Front-End Amplifier for EEG Acquisition in 65-nm CMOS
(2015)
Wu, Chung-Yu
;
Ho, Chia-Shiung
;
電子工程學系及電子研究所
;
生醫電子轉譯研究中心
;
Department of Electronics Engineering and Institute of Electronics
An 8-channel chopper-stabilized analog front-end amplifier (AFEA) is designed in 65-nm CMOS for continuous EEG signal acquisition. The AFEA is composed of eight capacitively coupled chopper instrumentation amplifiers (CCCIAs) with chopper-stabilized circuits and band-pass filters, a multiplexed transconductor, and a transimpedance amplifier. The CCCIA employs an inverter-based folded-cascode amplifier (IBFC) to achieve a better noise-to-power tradeoff and a high gain under 1 V power supply, a DC servo loop to suppress electrode offset and provide a low high-pass corner, a low power ripple reduction loop to suppress chopping ripple, and a positive feedback loop to boost its input impedance. The fabricated AFEA has 59.1/69.8/78 dB programmable gain and 0.81 mu Vrms input-referred noise in a bandwidth of 0.5-100 Hz. The measured power consumption of a single CCCIA is 0.87 mu W. The proposed CCCIA has a lower NEF of 2.97 than other CCCIA for EEG acquisition.