A 2μW biomedical frontend with ΣΔ ADC for self-powered U-healthcare devices in 0.18μm CMOS technology

Author

Jha, Pankaj ; Patra, Pravanjan ; Naik, Jairaj ; Dutta, Ashudeb ; Acharya, Amit ; Rajalakshmi, P. ; Singh, Shiv Govind

Author_Institution

Dept. of Electr. Eng., Indian Inst. of Technol. Hyderabad, Hyderabad, India

fYear

2015

fDate

7-10 June 2015

Firstpage

1

Lastpage

4

Abstract

This paper presents an ultra-low power analog front end (AFE) with ΣΔ modulator ADC meant for acquisition of biopotential signals. The system consists of a signal conditioning stage with programmable gain and bandwidth, a mixed signal automatic gain control (AGC), and a ΣΔ ADC. The full system is designed in UMC 18μm CMOS. The AFE achieves an overall linearity of more 10 bits with 0.47μW power consumption. The ADC provides 2^nd order noise shaping while using single integrator and an ENOB of ~12 bits with 1.4μW power consumption. The system was successfully tested for a ECG signal from PTB database.

Keywords

CMOS integrated circuits; automatic gain control; biomedical electronics; electrocardiography; health care; low-power electronics; mixed analogue-digital integrated circuits; sigma-delta modulation; ΣΔ modulator ADC; 2^nd order noise shaping; AGC; CMOS technology; ECG signal; PTB database; UMC CMOS; biomedical frontend; biopotential signal acquisition; mixed signal automatic gain control; power 0.47 muW; power 1.4 muW; power 2 muW; power consumption; programmable bandwidth; programmable gain; self-powered U-healthcare devices; signal conditioning stage; single integrator; size 0.18 mum; ultra-low power analog front end; Detectors; Electrocardiography; Gain control; Modulation; Noise shaping; Power demand; Signal resolution;

fLanguage

English

Publisher

ieee

Conference_Titel

New Circuits and Systems Conference (NEWCAS), 2015 IEEE 13th International

Conference_Location

Grenoble

Type

conf

DOI

10.1109/NEWCAS.2015.7182054

Filename

7182054