Experimental characterization of the TOFPET2 ASIC

R. Bugalho, A. Di Francesco, L. Ferramacho, C. Leong, T. Niknejad, L. Oliveira, M. Rolo, J. C. Silva, R. Silva, M. Silveira, S. Tavernier, J. Varela

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27 Citations (Scopus)


We present the experimental characterization of the TOFPET2, a readout and digitization ASIC for radiation detectors using Silicon Photomultipliers. The circuit is designed in CMOS 110 nm technology, has 64 independent channels and is optimized for time-of-flight measurement in PET or other applications. The chip has quad-buffered TDCs and charge integration QDCs in each channel. The Coincidence Time Resolution (CTR) of 511 keV photon pairs from a 22 Na point source measured with 2 × 2 × 3 mm 3 LSO:Ce crystals co-doped with 0.2% Ca is 118 and 119 ps FWHM when using respectively the SiPMs NUVHD 40um from Fondazione Bruno Kessler (FBK) and the S14160-3050HS MPPC from Hamamatsu Photonics (HPK). The energy resolution obtained for the 511keV photopeak is 10.5 and 12% FWHM when using respectively the SiPMs PM3325-WB from KETEK and the QFBR-S4N44P164S from Broadcom Inc.

Original languageEnglish
Article numberP03029
JournalJournal of Instrumentation
Issue number3
Publication statusPublished - 29 Mar 2019


  • coronary CT angiography (CTA)
  • Front-end electronics for detector readout
  • Gamma camera
  • Instrumentation and methods for time-of-flight (TOF) spectroscopy
  • VLSI circuits


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