A reconfigurable medically cohesive biomedical front-end with ΣΔ ADC in 0.18µm CMOS

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

doi:10.1109/EMBC.2015.7318491

A reconfigurable medically cohesive biomedical front-end with ΣΔ ADC in 0.18µm CMOS

Annu Int Conf IEEE Eng Med Biol Soc. 2015 Aug:2015:833-6. doi: 10.1109/EMBC.2015.7318491.

Authors

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

PMID: 26736391
DOI: 10.1109/EMBC.2015.7318491

Abstract

This paper presents a generic programmable analog front-end (AFE) for acquisition and digitization of various biopotential signals. This includes a lead-off detection circuit, an ultra-low current capacitively coupled signal conditioning stage with programmable gain and bandwidth, a new mixed signal automatic gain control (AGC) mechanism and a medically cohesive reconfigurable ΣΔ ADC. The full system is designed in UMC 0.18μm 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 ~11 bits with 5μW power consumption. The system was successfully verified for various ECG signals from PTB database. This system is intended for portable batteryless u-Healthcare devices.

MeSH terms

Electrocardiography
Equipment Design*
Signal Processing, Computer-Assisted