An ultra-low leakage current Application Specific Integrated Circuit (ASIC) called\nUtopia (Ultralow Picoammeter) has been designed and fabricated in AMS 0.35 �¼m CMOS, in order\nto be used as the front-end for ionising radiation monitoring at CERN. It is based on the topology\nof a Current to Frequency Converter (CFC) through charge balancing and demonstrates a wide\ndynamic range of 8.5 decades without range changing. Due to a design aimed at minimising input\nleakage currents, input currents as low as 10 fA can be measured.
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