Design of a fA wide dynamic range ADC for current sensing

Design of a fA wide dynamic range ADC for current sensing Current sensing is important in various applications. The Utopia 2 Application Specific Integrated Circuit (ASIC) was developed in AMS 0.35 lm technology for radiation monitoring based on ionization chambers. The ASIC is able to measure current equal to 1 femtoampere (fA) after active leakage current compensation. The compensation is achieved with a second dummy compensating channel that is matched to the measuring channel. The ASIC was also designed to cope with input currents that span over nine decades of dynamic range. The analog to digital conversion is performed with charge balancing and counting. The maximum current that is equal to 5 lA can be measured after the introduction of a second range. The system has been characterized at a certified laboratory and is able to sense currents from 1 fA up to 5 lA. Keywords Femtoampere digitizer  Current-to-frequency conversion  Current readout circuit  Leakage current Femtoampere current measurements  Current sensing 1 Introduction should measure the produced output detector current I as det shown in Fig. 1. The monitoring of the ambient ionizing Various sensors produce a low current signal that has to be radiation dose is important in particle physics accelerators, measured by a readout circuit. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Analog Integrated Circuits and Signal Processing Springer Journals

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Engineering; Circuits and Systems; Electrical Engineering; Signal,Image and Speech Processing
ISSN
0925-1030
eISSN
1573-1979
D.O.I.
10.1007/s10470-018-1224-3
Publisher site
See Article on Publisher Site

Abstract

Current sensing is important in various applications. The Utopia 2 Application Specific Integrated Circuit (ASIC) was developed in AMS 0.35 lm technology for radiation monitoring based on ionization chambers. The ASIC is able to measure current equal to 1 femtoampere (fA) after active leakage current compensation. The compensation is achieved with a second dummy compensating channel that is matched to the measuring channel. The ASIC was also designed to cope with input currents that span over nine decades of dynamic range. The analog to digital conversion is performed with charge balancing and counting. The maximum current that is equal to 5 lA can be measured after the introduction of a second range. The system has been characterized at a certified laboratory and is able to sense currents from 1 fA up to 5 lA. Keywords Femtoampere digitizer  Current-to-frequency conversion  Current readout circuit  Leakage current Femtoampere current measurements  Current sensing 1 Introduction should measure the produced output detector current I as det shown in Fig. 1. The monitoring of the ambient ionizing Various sensors produce a low current signal that has to be radiation dose is important in particle physics accelerators, measured by a readout circuit.

Journal

Analog Integrated Circuits and Signal ProcessingSpringer Journals

Published: Jun 6, 2018

References

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