Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2010, Vol. 21 ›› Issue (1): 49-53 doi: 10.13538/j.1001-8042/nst.21.49-53

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LUT-based non-linearity compensation for BES III TOF’s time measurement

LIU Shubina,b FENG Changqinga,b YAN Hana,b AN Qia,b,*   

  1. 1 Key Laboratory of Technologies of Particle Detection & Electronics, Chinese Academy of Sciences, 2Anhui Key Laboratory of Physical Electronics, Department of Modern Physics, University of Science and technology of China, Hefei 230026 ,China
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LIU Shubin, FENG Changqing, YAN Han, AN Qi. LUT-based non-linearity compensation for BES III TOF’s time measurement.Nuclear Science and Techniques, 2010, 21(1): 49-53     doi: 10.13538/j.1001-8042/nst.21.49-53

Abstract:

The impact of the integral non-linearity (INL) to the time resolution of HPTDC (High Performance Time to Digital Converter) is presented in this paper. An INL correction method based on look-up table (LUT), is proposed to minimize such INL and improve the time resolution. This scheme is implemented in a single Field Programmable Gate Array (FPGA) device for real-time compensation. The INL characteristic estimation is based on a statistical approach, in which a sufficiently large number of random input signals are measured. The prototype tests show that the deviation for time resolution due to INL can be reduced greatly, from more than 80 ps to less than 20 ps, which can meet the requirement of BES (Beijing Spectrometer) III Time-Of-Flight detector.

Key words: INL, Resolution, HPTDC, LUT, Compensation