11nW Signal Acquisition Platform for Remote Biosensing

Abstract : This paper presents the design of an extremely low-energy biosensing platform that utilizes voltage to time conversion and time-mode signal processing to sense and accommodate electrophysiological biosignals that will be later sent remotely using a simple and low power communication scheme. The electrode input is fed to a chain of monostable multivibrators used as analog-to-time converters, which create time pulses whose widths are proportional to the input signal. These pulses are transmitted to an external receiver by means of single-pulse harmonic modulation as the communication scheme, at a carrier frequency of 10 MHz. The platform is designed to be implemented in a standard 0.18 um IC process with an energy dissipation per sample per channel of 42.72 pJ, including communication, operating from a supply voltage of 0.6 V with an input referred noise of 12.3 uVrms. The resulting SNR for OSR=256 is 35.19 dB, and the system’s power consumption at a sampling and communication rate of 256 Hz is 10.94 nW.

Published in Proceedings of IEEE Biomedical Circuis and Systems Conference (BioCAS) 2019

DOI: https://doi.org/10.1109/BIOCAS.2019.8919128

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 author = {Gancedo, A. and Akgun, O. C. and Serdijn, W. A.},
 booktitle = {Proceedings of IEEE Biomedical Circuits and Systems (BioCAS)},
 title = {{"11nW Signal Acquisition Platform for Remote Biosensing"}},
 month = {Oct}, 
 year = {2019},
 pages = {1-5},