Journal
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
Volume 8, Issue 6, Pages 834-843Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBCAS.2013.2296942
Keywords
Analog-to-digital converter (ADC); analog-to-information (A2I); asynchronous; continuous-time; electrocardiogram (ECG) monitoring; event-driven; level-crossing; pulse-triggered; QRS detection; wireless body sensor network (WBSN)
Funding
- National Research Foundation Competitive Research Programme [NRF-CRP8-2011-01]
- Faculty of Engineering Strategic Funding [R-263-000-A02-731]
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This paper presents an ultra-low-power event-driven analog-to-digital converter (ADC) with real-time QRS detection for wearable electrocardiogram (ECG) sensors in wireless body sensor network (WBSN) applications. Two QRS detection algorithms, pulse-triggered (PUT) and time-assisted PUT (t-PUT), are proposed based on the level-crossing events generated from the ADC. The PUT detector achieves 97.63% sensitivity and 97.33% positive prediction in simulation on the MIT-BIH Arrhythmia Database. The t-PUT improves the sensitivity and positive prediction to 97.76% and 98.59% respectively. Fabricated in 0.13 mu m CMOS technology, the ADC with QRS detector consumes only 220 nW measured under 300 mV power supply, making it the first nanoWatt compact analog-to-information (A2I) converter with embedded QRS detector.
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