9-15 June 2018
Woodlands Conference Center
America/New_York timezone
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An FPGA Based Fast Linear Discharge Method for Nuclear Pulse Digitization

14 Jun 2018, 14:35
1h 30m
Woodlands Conference Center

Woodlands Conference Center

159 Visitor Center Dr, Williamsburg, VA 23185
Poster presentation Front End Electronics and Fast Digitizers Poster 2

Speakers

Prof. Yonggang Wang (Department of Modern Physics, University of Science and Technology of China)Mr Jie Kuang (Department of Modern Physics, University of Science and Technology of China)

Description

Inspired by Wilkinson ADC method, we implement a fast linear discharge method based on FPGA to digitize nuclear pulse signal. In this scheme, we use a constant current source to discharge the charge on capacitor which is integrated by the input current pulse so as to convert the amplitude of the input nuclear pulse into time width linearly. Thanks to the high precision of TDC measurement that we have achieved in FPGA, we can increase the current value of the discharge to make the discharge time short, so as to obtain a small measurement of dead time. We has realized a single channel fast linear discharge circuit which contains only one dual supply amplifier, two resistors and one capacitor. The rest part can be implemented in an FPGA (Field Programmable Gate Array). Leakage current from the sensor would cause the base line drifting slowly, which can influence the measuring precision. Our method solve this problem without losing the linearity of measurement. We have built the circuit and experimental setup for evaluation. Using them to measure energy spectrums of PET detectors of PMT coupled with LYSO and LaBr3 crystal, the energy resolution is 12.67% and 5.17% respectively. The test results show that our circuit is rather simple, stable and conducive for multi-channel integration.

Institute USTC
Speaker Yonggang Wang
Description Algo Wilkinson ADC
Minioral Yes
Country China

Primary author

Mr Xiaoguang Kong (Department of Modern Physics, University of Science and Technology of China)

Co-authors

Prof. Yonggang Wang (Department of Modern Physics, University of Science and Technology of China) Mr Liwei Wang (Department of Modern Physics, University of Science and Technology of China) Mr Yong Xiao (Department of Modern Physics, University of Science and Technology of ChinaDepartment of Modern Physics, University of Science and Technology of China) Mr Jie Kuang (Department of Modern Physics, University of Science and Technology of China)

Presentation Materials