Design considerations for an 8-decade current-to-digital converter with fA sensitivity

• Autorzy: Voulgari E. , Noy M. , Anghinolfi F. , Perrin D. , Krummenacher F. , Kayal M.
• Języki publikacji: EN

Abstrakty

EN

Radiation measurements for high energy physics experiments, nuclear facilities, hospitals and hadron therapy institutes require precise low current sensing. This paper provides a methodology for experimental characterisation of the leakage current sources present at the input of a current-to-digital converter. The limitations in sub-picoampere current measurements are presented along with the design of an ASIC that can accurately measure currents in the femto-ampere range after integrating over sufficient time. Proposals to minimise the subthreshold leakage current of the switches connected to the input, the leakage current of the package, the leakage of the PCB and the leakage related to the ESD protection diodes are shown. The remaining leakage current can be measured and subtracted. The front-end can digitise currents over 8 decades produced by a radiation detector. These guidelines were established during the current design and testing and will be used for the second version of the front-end electronics that will be installed at CERN for radiation protection and monitoring.

Słowa kluczowe

EN

radiation monitoring; ultra-low current sensing; leakage currents; sub-picoampere current measurements

PL

pomiar promieniowania; prąd upływu; pomiar pikoamperów

• Wydawca: Lodz University of Technology. Department of Microelectronics and Computer Science
• Czasopismo: International Journal of Microelectronics and Computer Science
• Rocznik: 2015
• Tom: Vol. 6, nr 3
• Strony: 79--85
• Opis fizyczny: Bibliogr. 9 poz., il. kolor., wykr.

Twórcy

autor

Voulgari E.

• CERN, CH-1211 Geneva, Switzerland
• EPFL, CH-1015 Lausanne, Switzerland

autor

Noy M.

• CERN, CH-1211 Geneva, Switzerland

autor

Anghinolfi F.

• CERN, CH-1211 Geneva, Switzerland

autor

Perrin D.

• CERN, CH-1211 Geneva, Switzerland

autor

Krummenacher F.

• EPFL, CH-1015 Lausanne, Switzerland

autor

Kayal M.

• EPFL, CH-1015 Lausanne, Switzerland

Bibliografia

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• [5] Y. Tsividis, C. Mc Andrew, ”Operation and Modeling of the MOS transistor,” ISBN 9780195170153 Oxford university press, 2010.
• [6] G. Venturini, F. Anghinolfi, B. Dehning, F. Krummenacher, and M. Kayal, ”A 120dB dynamic-range radiation-tolerant charge-to-digital converter for radiation monitoring,” Microelectronics J., vol. 44, no. 12, pp. 1302-1308, Dec. 2013.
• [7] G. Mazza, R. Cirio, M. Donetti, A. La Rosa, A. Luparia, F. Marchetto, and C. Peroni, ”A 64-channel wide dynamic range charge measurement ASIC for strip and pixel ionization detectors,” IEEE Trans. Nucl. Sci., vol. 52, no. 4, pp. 847-853, Aug. 2005.
• [8] H. Flemming and E. Badura, ”A high dynamic charge to frequency converter ASIC,” p. 40, 2004.
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