A fully integrated two-channel A/D interface for the acquisition of cardiac signals in implantable pacemakers

Author

Gerosa, Andrea ; Maniero, Andrea ; Neviani, Andrea

Author_Institution

Dept. of Inf. Eng., Univ. of Padova, Italy

Volume

39

Issue

7

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

1083

Lastpage

1093

Abstract

This work presents an input stage for a cardiac pacemaker fully integrated in 0.35-μm CMOS technology. The system can acquire and digitize to 8 bits both atrial and ventricular electrical activity. Log-domain circuits are exploited to amplify and filter the input signal, while ΣΔ modulation is exploited to convert it. The design is power optimized, indeed the current consumption is limited to 2.9 μA, while the power supply ranges from 2.8 to 1.8 V. The total area is 2.2 mm² and experimental data prove correct filtering and a total dynamic range of at least 47 dB.

Keywords

CMOS integrated circuits; bioelectric potentials; circuit optimisation; filtering theory; pacemakers; sigma-delta modulation; 0.35 microns; 1.8 to 2.8 V; 2.9 muA; CMOS technology; atrial electrical activity; cardiac pacemaker; cardiac signals acquisition; current consumption; fully integrated A-D interface; implantable pacemakers; input signal; log-domain circuits; power optimization; sigma-delta modulation; two-channel A-D interface; ventricular electrical activity; Batteries; Biomedical measurements; CMOS technology; Dynamic range; Filtering; Filters; Integrated circuit measurements; Integrated circuit technology; Pacemakers; Voltage; Analog-to-digital converter; biomedical; cardiac pacemaker; sigma-delta;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2004.829921

Filename

1308582