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An Application Specific Integrated Circuit (ASIC) that is able to digitize input current starting from a few femtoamperes (fA) up to microamperes (μA), was designed for the environmental monitoring of the background radiation and for radiation protection at CERN. The Ultra-low Picoammeter 2 (Utopia 2) ASIC, is based on the current to frequency converter (CFC) architecture and can compensate for the...
This paper introduces some design and measurement techniques that were used in the design and the testing of an ASIC for ultra-low current sensing. The idea behind this paper is to present the limitations in sub-picoampere current measurements and demonstrate an ASIC that can accurately measure the different sources of leakage currents and the methodology of measuring. Then the leakage current can...
An Application Specific Integrated Circuit (ASIC) has been designed in order to demonstrate the limitations and the challenges in ultralow current sensing. The Utopia (Ultralow Picoammeter) ASIC is foreseen to be the front-end in the new radiation measurement system for personnel safety at CERN. It is based on the topology of a Current to Frequency Converter (CFC) and has a wide dynamic range of 7...
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