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

• 作 者: 陈进 张旭 陈弘达
• 机 构: State Key Laboratory of Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sc
• 出 处: 半导体学报
• 发表日期: 2010年07期
• 关键词: modulator delta sigma capacitor switched portable bandwidth recording analog con

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 × 290 μm ~ 2. Experimental results show that this achievable 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.