This paper presents a low-power ECG recording system-on-chip (SoC) with on-chip low-complexity lossless ECG compression for data reduction in wireless/ambulatory ECG sensor devices. The chip uses a linear slope predictor for data compression, and incorporates a novel low-complexity dynamic coding-packaging scheme to frame the prediction error into fixed-length 16-bit format. The proposed technique achieves an average compression ratio of 2.25x on MIT/BIH ECG database. Implemented in a standard 0.35 um process, the compressor uses 0.565K gates/channel occupying 0.4 mm2 for four channels, and consumes 535 nW/channel at 2.4 V for ECG sampled at 512 Hz. Small size and ultra-low power consumption makes the proposed technique suitable for wearable ECG sensor applications.
@article{arxiv.1409.8018,
title = {An ECG-on-Chip with 535-nW/Channel Integrated Lossless Data Compressor for Wireless Sensors},
author = {C. J. Deepu and X. Zhang and W. -S. Liew and D. L. T. Wong and Y. Lian},
journal= {arXiv preprint arXiv:1409.8018},
year = {2014}
}