TOFPET2: A high-performance ASIC for time and amplitude measurements of SiPM signals in time-of-flight applications

A. Di Francesco, R. Bugalho, Luis Oliveira, L. Pacher, A. Rivetti, M. Rolo, J. C. Silva, R. Silva, J. Varela

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We present a readout and digitization ASIC featuring low-noise and low-power for time-of flight (TOF) applications using SiPMs. The circuit is designed in standard CMOS 110 nm technology, has 64 independent channels and is optimized for time-of-flight measurement in Positron Emission Tomography (TOF-PET). The input amplifier is a low impedance current conveyor based on a regulated common-gate topology. Each channel has quad-buffered analogue interpolation TDCs (time binning 20 ps) and charge integration ADCs with linear response at full scale (1500 pC). The signal amplitude can also be derived from the measurement of time-over-threshold (ToT). Simulation results show that for a single photo-electron signal with charge 200 (550) fC generated by a SiPM with 320 pF capacitance the circuit has 24 (30) dB SNR, 75(39) ps r.m.s. resolution, and 4(8) mW power consumption. The event rate is 600 kHz per channel, with up to 2 MHz dark counts rejection.

Original languageEnglish
Article numberC03042
JournalJournal of Instrumentation
Volume11
Issue number3
DOIs
Publication statusPublished - 18 Mar 2016

Keywords

  • Analogue electronic circuits
  • Data acquisition circuits
  • Front-end electronics for detector readout
  • Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA)

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