Analog Front-end Circuit with Low-noise Amplifier and High-pass Sigma-Delta Modulator for an EEG or ECoG Acquisition System
(0) The present paper proposes an analog front-end (AFE) circuit, including only one low-noise amplifier with chopping techniques and one high-pass sigma-delta modulator (HPSDM), which can be applied as a sensing circuit for electroencephalogram or electrocorticogram (ECoG) signal acquisition systems. The low-noise amplifier, which has a close-loop gain of 20 V/V and CMRR of 109.6 dB, is implemented by a differential difference amplifier with feedback pseudo-resistors and capacitors. The HPSDM is implemented in a feed-forward architecture with an order of 3, an oversampling ratio of 128, and a 1-bit quantizer under a sampling frequency of 51.2 kHz. The TS.V1C 0.18 urn 1P6M CMOS process is used in the entire AFE circuit with a supply voltage of 1.2 V and power consumption of 28.7 μW. Within the maximum range of ECoG signals, the simulated SNR and SFDR of the entire AFE circuits are 70.8 and 73 dB, respectively.
Jia-Hua Hong Ming-Chun Liang Ming-Yang Haung Tsung-Heng Tsai Qiang Fang Shuenn-Yuh Lee
Department of Electrical Engineering,National Chung Cheng University, Chia-Yi, Taiwan School of Electrical and Computer Engineering,RMIT University, Melbourne, Victoria, Australia
国际会议
2011 International Symposium on Bioelectronics and Bioinformatics(第二届国际生物医学电子学与生物信息学学术会议 ISBB 2011)
苏州
英文
17-20
2011-11-03（万方平台首次上网日期，不代表论文的发表时间）