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Volume 313 - Topical Workshop on Electronics for Particle Physics (TWEPP-17) - ASIC
Characterization of a 9-Decade Femtoampere ASIC Front-End for Radiation Monitoring
E. Voulgari,* M. Noy, F. Anghinolfi, D. Perrin, F. Krummenacher, M. Kayal
*corresponding author
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Pre-published on: 2018 March 05
Published on: 2018 March 20
An ultra-low current sensing digitizer circuit was designed for radiation monitoring for personnel and environmental safety at CERN.
The Ultralow Picoammeter 2 (Utopia 2) ASIC includes some key functionalities like on-chip active leakage current compensation, charge balancing and range changing. It was designed in AMS 0.35 $\mu$m technology that was selected for its low leakage current performance. The architecture is based on the asynchronous current to frequency converter (CFC) and the front-end can digitize input currents over a wide dynamic range of 9 decades. If the measurement time is equal to 100 s, the ASIC can measure current as low as 1 femtoampere (fA). The calibration procedure and the measurements of the Utopia 2 ASIC are summarized in this article. The ASIC has been characterized for its ultra-low current performance at the Swiss Federal Institute of Metrology (METAS).
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