A high-pass pole shifting technique for bidirectional electrophysiological interfaces using a novel tunable analog filter block
File(s)
Accepted version
Author(s)
Petkos, Konstantinos
Drakakis, Emmanuel M
Type
Journal Article
Abstract
This article details the design of a high-pass pole
shifting technique, which can achieve a rapid recovery of the analog front-end (AFE) electronics from strong stimulation pulses and electrochemical dc offsets in bidirectional electrophysiologi cal interfaces. The technique is implemented by making use of a novel continuous-time analog filter block that offers tunability in the applied cutoff frequency, scalability, real time, and low-noise recording capabilities, along with the capability of interfacing with various types of sensors. The measurement results of this work prove that the proposed technique can offer low integrated noise values (<2 µVrms from 0.5 Hz up to 4 kHz) and immediate recording of the biosignal of interest after the stimulation pulse
when implemented with the specific tunable filter. The recorded biosignals are free from undesired ringing oscillations or phase shifts. All those merits render this technique as a versatile and reliable solution to be used in a wide range of applications and environments.
shifting technique, which can achieve a rapid recovery of the analog front-end (AFE) electronics from strong stimulation pulses and electrochemical dc offsets in bidirectional electrophysiologi cal interfaces. The technique is implemented by making use of a novel continuous-time analog filter block that offers tunability in the applied cutoff frequency, scalability, real time, and low-noise recording capabilities, along with the capability of interfacing with various types of sensors. The measurement results of this work prove that the proposed technique can offer low integrated noise values (<2 µVrms from 0.5 Hz up to 4 kHz) and immediate recording of the biosignal of interest after the stimulation pulse
when implemented with the specific tunable filter. The recorded biosignals are free from undesired ringing oscillations or phase shifts. All those merits render this technique as a versatile and reliable solution to be used in a wide range of applications and environments.
Date Issued
2025-03-12
Date Acceptance
2025-01-07
Citation
IEEE Transactions on Instrumentation and Measurement, 2025, 74
ISSN
0018-9456
Publisher
Institute of Electrical and Electronics Engineers
Journal / Book Title
IEEE Transactions on Instrumentation and Measurement
Volume
74
Copyright Statement
Copyright © 2025 IEEE. This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Subjects
AMPLIFIER
Analog filtering
analog front-end (AFE)
ARTIFACT
bidirectional systems
bioelectrical signals
bioinstrumentation
concurrent stimulation and biosignal recording
Engineering
Engineering, Electrical & Electronic
high-pass pole shifting
Instruments & Instrumentation
MOTOR CORTEX
NEUROMODULATION DEVICE
rapid recovery
RECORDINGS
Science & Technology
SUPPRESSION
Technology
TRANSCRANIAL MAGNETIC STIMULATION
tunable filter
WIRELESS
Publication Status
Published
Article Number
4004610
Date Publish Online
2025-03-12