Organic electrochemical transistor common‐source amplifier for electrophysiological measurements
File(s)
Published version
OA Location
Author(s)
Tyrrell, James E
Petkos, Konstantinos
Drakakis, Emmanuel M
Boutelle, Martyn G
Campbell, Alasdair J
Type
Journal Article
Abstract
The portability of physiological monitoring has necessitated the biocompatibility of components used in circuitry local to biological environments. A key component in processing circuitry is the linear amplifier. Amplifier circuit topologies utilize transistors, and recent advances in bioelectronics have focused on organic electrochemical transistors (OECTs). OECTs have shown the capability to transduce physiological signals at high signal-to-noise ratios. In this study high-performance interdigitated electrode OECTs are implemented in a common source linear amplifier topology. Under the constraints of OECT operation, stable circuit component parameters are found, and OECT geometries are varied to determine the best amplifier performance. An equation is formulated which approximates transistor behavior in the linear, nonlinear, and saturation regimes. This equation is used to simulate the amplifier response of the circuits with the best performing OECT geometries. The amplifier figures of merit, including distortion characterizations, are then calculated using physical and simulation measurements. Based on the figures of merit, prerecorded electrophysiological signals from spreading depolarizations, electrocorticography, and electromyography fasciculations are inputted into an OECT linear amplifier. Using frequency filtering, the primary features of events in the bioelectric signals are resolved and amplified, demonstrating the capability of OECT amplifiers in bioelectronics.
Date Issued
2021-08-16
Date Acceptance
2021-05-12
Citation
Advanced Functional Materials, 2021, 31 (33), pp.1-13
ISSN
1616-301X
Publisher
Wiley
Start Page
1
End Page
13
Journal / Book Title
Advanced Functional Materials
Volume
31
Issue
33
Copyright Statement
© 2021 The Authors. Advanced Functional Materials published by Wiley-VCH GmbH
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Identifier
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202103385
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
bioelectronics
electrophysiology
linear amplifiers
organic electrochemical transistors
plastic electronics
HIGH-PERFORMANCE
TRANSCONDUCTANCE
RECORDINGS
WIRELESS
DEVICE
STATE
Materials
02 Physical Sciences
03 Chemical Sciences
09 Engineering
Publication Status
Published
Date Publish Online
2021-06-12