Activity Dependent Multichannel ADC Architecture using Level Crossing Quantisation for Atrial Electrogram Recording

Activity Dependent Multichannel ADC Architecture using Level Crossing Quantisation for Atrial Electrogram Recording

Das, Aurojyoti (Student TU Delft)
Rout, S. (TU Delft Bio-Electronics)
Urso, A. (TU Delft Bio-Electronics)
Serdijn, W.A. (TU Delft Bio-Electronics)

2019-10-01

This paper presents a novel multichannel level-crossing (MLC) ADC architecture aimed at recording atrial electrograms from multiple channels. The proposed architecture combines synchronous sampling with level-crossing (LC) quantisation to achieve activity dependent operation while recording from multiple channels simultaneously. In the proposed architecture the number of comparisons performed by the quantiser to reach a decision is dependent on the activity of the input signal and is 2-3.3 times lower than that in a conventional SAR ADC. The architecture uses one comparator and one reference level instead of two comparators and two reference levels as in conventional LC ADCs. The proposed architecture is modeled in VerilogA and is designed to be implemented in a standard 0.18 um CMOS process. The MLC ADC converts signals from 4 channels simultaneously and achieves an SFDR of 53.33 dB and an SNDR of 48.96 dB while consuming 9.32 μW of power from a 1.8 V power supply.

asynchronous
atrial electrogram
biosignal acquisition
event-driven
level crossing
multichannel LC ADC

http://resolver.tudelft.nl/uuid:3eb9fdbd-2578-40ac-a509-e463d6c02321

https://doi.org/10.1109/BIOCAS.2019.8919156

Institute of Electrical and Electronics Engineers (IEEE)

9781509006175

BioCAS 2019 - Biomedical Circuits and Systems Conference, Proceedings

2019 IEEE Biomedical Circuits and Systems Conference, BioCAS 2019, 2019-10-17 → 2019-10-19, Nara, Japan

Institutional Repository

conference paper

© 2019 Aurojyoti Das, S. Rout, A. Urso, W.A. Serdijn