Characterization of Non-Uniform 2-bit Sigma-Delta Modulator for Gamma-Ray Detectors

Maria Ruiz-Gonzalez, Lars R. Furenlid

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To reduce the complexity of the front-end electronics of systems with large number of channels, we have proposed a novel analog-to-digital conversion method based on non-uniform 2-bit sigma-delta modulation. The proposed method simplifies the data acquisition for gamma-ray detectors that require waveform capture to perform analyses such as pile-up detection, pulse-shape discrimination, and maximum-likelihood energy and timing estimation. The modulator consists of an integrator, three comparators with programmable thresholds, one R-2R ladder digital-to-analog converter, and a field-programmable gate array. We have designed a nine-channel front-end board based on a combination of 1-bit SDM for energy estimation, and 2-bit SDM for timing estimation and waveform analysis. In this work, we present the characterization of the non-uniform 2-bit sigma-delta modulator for gamma-ray detection. The metrics utilized to measure performance are integral non-linearity, differential non-linearity, and timing resolution.

Original languageEnglish (US)
Title of host publication2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728141640
DOIs
StatePublished - Oct 2019
Event2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019 - Manchester, United Kingdom
Duration: Oct 26 2019Nov 2 2019

Publication series

Name2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019

Conference

Conference2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019
CountryUnited Kingdom
CityManchester
Period10/26/1911/2/19

ASJC Scopus subject areas

  • Signal Processing
  • Radiology Nuclear Medicine and imaging
  • Nuclear and High Energy Physics

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  • Cite this

    Ruiz-Gonzalez, M., & Furenlid, L. R. (2019). Characterization of Non-Uniform 2-bit Sigma-Delta Modulator for Gamma-Ray Detectors. In 2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019 [9059641] (2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/NSS/MIC42101.2019.9059641