Low-power switched-capacitor delta-sigma modulator for EEG recording applications  

作　　者：陈进 张旭 陈弘达 

机构地区：[1]State Key Laboratory of Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences

出　　处：《Journal of Semiconductors》2010年第7期121-126,共6页半导体学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.60776024,60877035,90820002,60976026);the National High Technology Research and Development Program of China(Nos.2007AA04Z329,2007AA04Z254).

摘　　要：This paper presents a third-order single-loop delta-sigma modulator of a biomedical micro-system for portable electroencephalogram（EEG） monitoring applications.To reduce the power consumption,the loop filter of the proposed modulator is implemented by applying a switched-capacitor structure.The modulator is designed in a 0.35-μm 2P4M standard CMOS process,with an active area of 365×290μm^2.Experimental results show that this modulator achieves a 68 dB dynamic range with an input sinusoidal signal of 100 Hz signal bandwidth under a 64 over-sampling ratio.The whole circuit consumes 515μW under a 2.5 V power supply,which is suitable for portable EEG monitoring.This paper presents a third-order single-loop delta-sigma modulator of a biomedical micro-system for portable electroencephalogram（EEG） monitoring applications.To reduce the power consumption,the loop filter of the proposed modulator is implemented by applying a switched-capacitor structure.The modulator is designed in a 0.35-μm 2P4M standard CMOS process,with an active area of 365×290μm^2.Experimental results show that this modulator achieves a 68 dB dynamic range with an input sinusoidal signal of 100 Hz signal bandwidth under a 64 over-sampling ratio.The whole circuit consumes 515μW under a 2.5 V power supply,which is suitable for portable EEG monitoring.

关 键 词：analog-to-digital converter delta-sigma modulator EEG switched-capacitor circuit 

分 类 号：TN761[电子电信—电路与系统]