HEEPidermis: a versatile SoC for BioZ recording
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arXiv
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| Format: | Preprint |
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2025
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| author | Sapriza, Juan Grassano, Beatrice Naclerio, Alessio Quadri, Filippo Terzano, Tommaso Mallasén, David Schiavone, Davide Leplae, Robin Moullet, Jérémie Levisse, Alexandre Müller, Christoph Graziano, Mariagrazia Miguez, Matías Atienza, David |
| author_facet | Sapriza, Juan Grassano, Beatrice Naclerio, Alessio Quadri, Filippo Terzano, Tommaso Mallasén, David Schiavone, Davide Leplae, Robin Moullet, Jérémie Levisse, Alexandre Müller, Christoph Graziano, Mariagrazia Miguez, Matías Atienza, David |
| contents | Biological impedance (BioZ) is an information-packed modality that allows for non-invasive monitoring of health and emotional state. Currently, most research involving tissue impedance is based on bulky or fixed-purpose hardware, which limits the scope of research and the possibilities of experiments. In this work, we present HEEPidermis: a System-on-Chip (SoC) which integrates all the blocks needed for tissue impedance measurement, including two 8-bit, arbitrary-signal current DACs, two VCO-based ADCs, and a RISC-V CPU to enable on-chip feature extraction for closed-loop operation. An event-based sub-sampler improves storage and energy efficiency for long-term recording. In addition to the versatile SoC, the digital back-end and behavioral models of the analog front-end are open-source, allowing fast system-level simulations or repurposing. The SoC was taped out on TSMC 65 nm LP process. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_04528 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HEEPidermis: a versatile SoC for BioZ recording Sapriza, Juan Grassano, Beatrice Naclerio, Alessio Quadri, Filippo Terzano, Tommaso Mallasén, David Schiavone, Davide Leplae, Robin Moullet, Jérémie Levisse, Alexandre Müller, Christoph Graziano, Mariagrazia Miguez, Matías Atienza, David Instrumentation and Detectors Hardware Architecture Medical Physics Biological impedance (BioZ) is an information-packed modality that allows for non-invasive monitoring of health and emotional state. Currently, most research involving tissue impedance is based on bulky or fixed-purpose hardware, which limits the scope of research and the possibilities of experiments. In this work, we present HEEPidermis: a System-on-Chip (SoC) which integrates all the blocks needed for tissue impedance measurement, including two 8-bit, arbitrary-signal current DACs, two VCO-based ADCs, and a RISC-V CPU to enable on-chip feature extraction for closed-loop operation. An event-based sub-sampler improves storage and energy efficiency for long-term recording. In addition to the versatile SoC, the digital back-end and behavioral models of the analog front-end are open-source, allowing fast system-level simulations or repurposing. The SoC was taped out on TSMC 65 nm LP process. |
| title | HEEPidermis: a versatile SoC for BioZ recording |
| topic | Instrumentation and Detectors Hardware Architecture Medical Physics |
| url | https://arxiv.org/abs/2509.04528 |