Print Email Facebook Twitter A Chip Integrity Monitor for Evaluating Long-term Encapsulation Performance Within Active Flexible Implants Title A Chip Integrity Monitor for Evaluating Long-term Encapsulation Performance Within Active Flexible Implants Author Akgün, O.C. (TU Delft Bio-Electronics) Nanbakhsh, K. (TU Delft Bio-Electronics) Giagka, Vasiliki (TU Delft Bio-Electronics; Fraunhofer Institute for Reliability and Microintegration IZM) Serdijn, W.A. (TU Delft Bio-Electronics) Date 2019-10-18 Abstract One key obstacle in employing silicon integrated circuits in flexible implants is ensuring a long-term operation of the chip within the wet corrosive environment of the body. For this reason, throughout the years, various biocompatible insulating materials have been proposed, yet, evaluating their long-term encapsulation performance on representative silicon samples still remains to be the main challenge. For this aim, in this work, a sensitive platform is introduced that can track the integrity of the chip against water and ion ingress. This platform is developed to be used for long-term monitoring of chip integrity and study of encapsulation layers in wet environments. The platform comprises a sensing array and a measurement engine and operates by tracking the changes in the inter-layer dielectric resistance within the chip. The proposed system uses a novel charge/discharge-based time-mode resistance sensor that can be implemented using simple yet highly robust circuitry. The sensor array is implemented together with the measurement engine in a standard 0.18 µm 6-metal CMOS process. For chip validation, dry and wet measurements in saline are presented in this paper. Subject charge-dischargeChip integrityencapsulationflexible implantsmonitoringreliability.time-mode operation To reference this document use: http://resolver.tudelft.nl/uuid:b7608a27-cb21-40c3-80fd-29a90368c0af DOI https://doi.org/10.1109/BIOCAS.2019.8919203 Event Biomedical Circuits and Systems Conference 2019, 2019-10-17 → 2019-10-19, Nara, Japan Part of collection Institutional Repository Document type conference paper Rights © 2019 O.C. Akgün, K. Nanbakhsh, Vasiliki Giagka, W.A. Serdijn Files PDF biocas2019_1a.pdf 1.8 MB Close viewer /islandora/object/uuid:b7608a27-cb21-40c3-80fd-29a90368c0af/datastream/OBJ/view