Pseudo asynchronous level crossing ADC for ECG signal acquisition
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Author (Corporation)
Publication date
2017
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01A - Journal article
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Parent work
IEEE Transactions on Biomedical Circuits and Systems
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Volume
11
Issue / Number
2
Pages / Duration
267-278
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Publisher / Publishing institution
IEEE
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Abstract
A new pseudo asynchronous level crossing analogue-to-digital converter (ADC) architecture targeted for low-power, implantable, long-term biomedical sensing applications is presented. In contrast to most of the existing asynchronous level crossing ADC designs, the proposed design has no digital-to-analogue converter (DAC) and no continuous time comparators. Instead, the proposed architecture uses an analogue memory cell and dynamic comparators. The architecture retains the signal activity dependent sampling operation by generating events only when the input signal is changing. The architecture offers the advantages of smaller chip area, energy saving and fewer analogue system components. Beside lower energy consumption the use of dynamic comparators results in a more robust performance in noise conditions. Moreover, dynamic comparators make interfacing the asynchronous level crossing system to synchronous processing blocks simpler. The proposed ADC was implemented in 0.35 μm complementary metal-oxide-semiconductor (CMOS) technology, the hardware occupies a chip area of 0.0372 mm 2 and operates from a supply voltage of 1.8 V to 2.4 V. The ADC's power consumption is as low as 0.6 μW with signal bandwidth from 0.05 Hz to 1 kHz and achieves an equivalent number of bits (ENOB) of up to 8 bits.
Keywords
analogue memory cell, analogue-to-digital conversion (ADC), asynchronous level crossing ADC, dynamic compara tor, ECG recording, level crossing
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ISBN
ISSN
1932-4545
1940-9990
1940-9990
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Publication status
Published
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Peer review of the complete publication
Open access category
Closed
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Citation
Thanks, M., Niederhauser, T., Haeberlin, A., Wildhaber, R., Vogel, R., Goette, J., & Jacomet, M. (2017). Pseudo asynchronous level crossing ADC for ECG signal acquisition. IEEE Transactions on Biomedical Circuits and Systems, 11(2), 267–278. https://doi.org/10.1109/tbcas.2016.2619858