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 0.18μm IC process with an energy dissipation per sample per channel of 42.72 pJ, including communication, operating from a supply voltage of 0.6V with an input referred noise of 12.3 μVrms. 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.
Original language | English |
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Title of host publication | BioCAS 2019 - Biomedical Circuits and Systems Conference, Proceedings |
Number of pages | 4 |
ISBN (Electronic) | 978-1-5090-0617-5 |
DOIs | |
Publication status | Published - 1 Oct 2019 |
Event | Biomedical Circuits and Systems Conference 2019 - Nara, Japan Duration: 17 Oct 2019 → 19 Oct 2019 https://biocas2019.org/ |
Conference
Conference | Biomedical Circuits and Systems Conference 2019 |
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Abbreviated title | BioCAS 2019 |
Country/Territory | Japan |
City | Nara |
Period | 17/10/19 → 19/10/19 |
Internet address |
Keywords
- EEG
- inductive link
- low-power CMOS
- time-mode operation
- ultra-low energy