Welcome to YODA – Open Digital Archive for CSEM

The YODA archive gives access to CSEM's publications, such as its annual reports and brochures. For technical papers such as scientific publications, bibliographic information is provided, along with the full paper where this is possible.

This comprehensive database is part of CSEM's Open Access Publishing policy. For further information refer to the YODA support guide or contact repository@csem.ch.

Recent Submissions

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    An Integrated MEMS Magnetic Gradiometer Rejecting Vibrations and Stray Fields
    (2024-09-09) Gasparin, Enrico; Hoogerwerf, Arno; Bayat, Dara; Spinola Durante, Guido; Petremand, Yves; Tormen, Maurizio; Despont, Michel; Close
    Due to electrification, magnetic sensors are increasingly deployed in magnetically polluted environments. To reject stray fields, differential sensing schemes are typically used. In this paper, we rely instead on a single-point gradiometric sensing scheme based on the force exerted on a magnet, which is directly related to the magnetic field gradient. Unlike the prior art, our concept uses a differential MEMS force-sensing mechanical transducer. The overall sensor rejects not only magnetic stray fields, but also mechanical disturbances such as vibration and gravity. It is the first single-point MEMS gradiometer that can operate unshielded in various orientations. Our prototype realization achieves a noise density of 4 nT/mm/√Hz in a ±300 μT/mm measurement range. We demonstrate its operational effectiveness in a bus-bar current sensing application. Finally, the paper discusses the remaining weaknesses and provides an outlook for MEMS-based magnetic sensors.
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    OVERVIEWOF DESIGN CHALLENGES IN HIGH-PERFORMANCE EXG INTERFACES
    (2023-06-22) Badami, Komail; Pons Sole, Marc; Mavrogordatos, Themistoklis; Fivaz, Andre; Persechini, Pascal; Chételat, Olivier; Ruedi, Pierre-Francois; Emery, Stephane
    Progress in CMOS technology and a huge impetus on biomedical research has moved biopotential monitoring systems from bedside devices in clinical setups to wearable devices in the home environment. Inspite of the significant progress, design of an ExG readout system poses several circuit and system level challenges. The designed circuit should exhibit very large differential offset handling capability yet while amplifying very low frequency small ExG signals. The system should maintain high immunity to large common-mode signals arising from EMI from the mains supply or from motion artefacts. Further, systems designed for wearable and long term monitoring should be comfortable for the patient without restricting mobility, yet while enabling high noise/power efficiency. An overview of these challenges and state-of-art-solutions to mitigate them are discussed in this chapter.
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    Plug-in Plug-Out Multibeam Dielectric Rod Antenna for Target Dedicated mm-Wave RF-WPT Applications
    (2024-03-17) Ahmadi Najafabadi, Amir Mohsen; Ramirez, German A.; Ghorbanpoor, Mohsen; Vorobyov, Alexander; Nussbaum, Pascal; Skrivervik, Anja
    This paper introduces a beam-adjustable multibeam dielectric rod antenna for mm-wave RF-WPT applications. The unique multibeam setup allows the generation of several adjustable beams simultaneously. This is conceptualized by utilizing three and five rods to create a beam coverage between - 30° to 30° in the azimuth plane. In the proposed configuration, the peak gain value of each generated beam is 13 dBi at 23.8 GHz. A gain value above 12 dBi is maintained between 20 GHz and 24 GHz. The Rexolite rod is fed through an annular slot fabricated on a Rogers RO4003 substrate. The adjustable nature of this configuration makes the solution agile, with the possibility of adaptation to different scenarios either by altering the number of unit elements employed or their orientation. This capability, together with the low cost of the proposed solution, makes it a promising power delivery solution for Internet of Things (IoT).
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    An Ultra-Low-Power Serial Implementation for Sigmoid and Tanh Using CORDIC Algorithm
    (2023-04) Chang, Yaoxing; Jokic, Petar; Emery, Stephane; Benini, Luca
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    Point-of-Care Fluorescence Biosensing System for Rapid Multi-Allergen Screening
    (2024-05-21) Demuru, Silvia; Chai-Gao, Hui; Shynkarenko, Yevhen; Hermann, Nicola; Boia, Patricia; Cristofolini, Peter; Petkus, Bradley; Generelli, Silvia; Paoletti, Samantha; Cattaneo, Stefano; Burr, Loic
    With the steady increase in allergy prevalence worldwide, there is a strong need for novel diagnostic tools for precise, fast, and less invasive testing methods. Herein, a miniatured fluorescence-based biosensing system is developed for the rapid and quantitative detection of allergenspecific immunoglobulin-E. An antibody-based fluorescence assay in a microfluidic-patterned slide, combined with a custom-made portable fluorescence reader for image acquisition and user-friendly software for the data analysis, enables obtaining results for multiple allergens in just ~1 h with only 80 µL of blood serum. The multiplexed detection of common birch, timothy grass, cat epithelia, house dust mite, and dog epithelia shows quantitative IgE-mediated allergic responses to specific allergens in control serum samples with known total IgE concentration. The responses are verified with different control tests and measurements with a commercial fluorescence reader. These results open the door to point-of-care allergy screening for early diagnosis and broader access and for largescale research in allergies.

Communities in YODA

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  • CSEM Archive
    The YODA archive contains two collections. The “Research Publications” collection provides bibliographic information for scientific papers including conference proceedings and presentations. And the "Marketing Material" collection includes corporate reports, brochures, and more.