Self-Calibrating Circuit for Implantable Current Stimulators

Natalia Martínez, Matías Miguez, Juan Sapriza, Joel Gak, Alfredo Arnaud

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this work, a self-calibrating circuit aimed at balancing biphasic current stimulators for Implantable Medical Devices (IMDs) is presented. Mismatched biphasic pulses cause a charge-unbalanced stimulation leading to tissue damage over time. The proposed module is an integrating, precision current comparator capable of detecting a 0.6% typical charge mismatch between the stimulating phases. The circuit's output can be used by a trimmable current stimulator to protect the tissue by reducing the injected net charge error. The total current consumption of the circuit is 1.5 μAduring a 430 μS operating cycle. It was designed and fabricated in a 0.18 μm CMOS-HV technology, occupying a total area of 0.30 mm2. The circuit can also be adapted to measure Electrode-Tissue Interface (ETI) impedance.

Original languageEnglish
Title of host publicationLASCAS 2023 - 14th IEEE Latin American Symposium on Circuits and Systems, Proceedings
EditorsMonica Karel Huerta
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665457057
DOIs
StatePublished - 2023
Event14th IEEE Latin American Symposium on Circuits and Systems, LASCAS 2023 - Quito, Ecuador
Duration: 27 Feb 20233 Mar 2023

Publication series

NameLASCAS 2023 - 14th IEEE Latin American Symposium on Circuits and Systems, Proceedings

Conference

Conference14th IEEE Latin American Symposium on Circuits and Systems, LASCAS 2023
Country/TerritoryEcuador
CityQuito
Period27/02/233/03/23

Keywords

  • Current Calibration
  • Implantable Medical Devices
  • Low-Power Design

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