Fully Integrated Pitch-Matched AlScN PMUT-on-CMOS Array for High- Resolution Ultrasound Images
This article presents a fully integrated pitch-matched piezoelectric micromachined ultrasonic transducers (PMUTs)-on-CMOS array with high potential in catheter-based ultrasound imaging systems and capabilities to obtain resolutions under 100 μ m. The system-on-chip (SoC) consists of 7 × 7 AlScN PMUT...
| Autores: | , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2024 |
| País: | España |
| Recursos: | Universitat Autònoma de Barcelona |
| Repositório: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglês |
| OAI Identifier: | oai:ddd.uab.cat:293733 |
| Acesso em linha: | https://ddd.uab.cat/record/293733 https://dx.doi.org/urn:doi:10.1109/JSEN.2024.3385911 |
| Access Level: | Acceso aberto |
| Palavra-chave: | AlScN piezoelectric micromachined ultrasonic transducer (PMUT) Catheter-based ultrasound systems High resolution PMUTs PMUT-on-CMOS Ultrasound images |
| Resumo: | This article presents a fully integrated pitch-matched piezoelectric micromachined ultrasonic transducers (PMUTs)-on-CMOS array with high potential in catheter-based ultrasound imaging systems and capabilities to obtain resolutions under 100 μ m. The system-on-chip (SoC) consists of 7 × 7 AlScN PMUTs connected in a 1-D configuration where the six external rows are used to generate the acoustic pressure through three high-voltage (HV)-pulser CMOS circuits, and the central row is used to sense the incoming ultrasound wave which will be amplified by a low-noise amplifier (LNA) CMOS amplifier. The experimental verification in a liquid environment gave, as a first result, a peak frequency of 7.7 MHz with a normalized pressure (ST) of 1.98 k Pa_ pp ∗mm∗V-1 and receiving sensitivity (SR) of 3.3 V/MPa, respectively, competitive sensitivities in comparison to the state-of-the-art. In the second part, ultrasonic imaging for different wires with a minimum diameter of 25 μ m was demonstrated as expected from numerical simulations. The system's performance for ultrasound images was evaluated considering the product of the area and the resolution at 1 mm, giving competitive values compared with other reported ultrasound systems for catheter-based medical ultrasound imaging and the only one providing monolithic integration with the CMOS front-end circuitry. |
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