Characterization of a 9-Decade Femtoampere ASIC Front-End for Radiation Monitoring

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 μm 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)


Publié dans:
Proceedings of Science, 313, 003
Présenté à:
Topical Workshop on Electronics for Particle Physics (TWEPP-17), Santa Cruz, California, 11 - 14 September 2017
Année
Mar 20 2018
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 Notice créée le 2018-08-31, modifiée le 2019-08-12

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