Dual-Polarity SiPM Readout Electronics Based on 1-bit Sigma-Delta Modulation Circuit for PET Detector Applications

Xinyi Cheng, Kun Hu, Yiping Shao

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We investigated a simple and effective method to extend 1-bit sigma-delta modulation (SDM) circuit-based charge-to-digital converter (QDC) to read dual-polarity silicon photomultiplier (SiPM) output signals. With the same QDC circuit but different voltage biases to the circuit components, the new circuit can read and process both positive and negative polarity signals. We conducted experimental studies to validate its ability to read and process dual-polarity signals and evaluated its performance for Positron Emission Tomography (PET) detector applications. The results, based on energy, coincidence timing, and crystal identification measurements, show that the circuit provides equal electronics capability for readout of both polarity signals and good performance for SiPM array-based PET imaging detector applications. Overall, the dual-polarity QDC readout electronics can be easily implemented to extend the range of signal polarity and to provide effective and flexible detector frontend electronics for reading single- or dual-polarity SiPM output signals.

Original languageEnglish (US)
Article number8782569
Pages (from-to)2107-2113
Number of pages7
JournalIEEE Transactions on Nuclear Science
Issue number9
StatePublished - Sep 2019


  • Readout electronics
  • scintillator detector
  • sigma-delta modulation (SDM)
  • silicon photomultiplier (SiPM) array

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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