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All-in-one SiPM read-out for multimodal PET inserts


Triroc 1A is a 64-channel front-end ASIC designed to readout silicon photomultipliers (SiPM) with both polarities for particle time-of-flight measurement applications. Triroc 1A combines a very fast and low-jitter trigger with accurate charge and time measurements. Energy and time are digitized internally with a 10-bit ADC and 30ps-bin TDC.
The concept of the ASIC is to combine two measurement lines that won’t interfere one with each other to measure both first incident photon timing measurement and whole crystal light charge integration.
An adjustment of the SiPM high voltage is possible using a channel-by-channel input DAC. It allows a fine SiPM gain and dark noise adjustment at the system level to correct for the non-uniformity of SiPMs.
The power consumption is 10 mW/channel, excluding buffers used to output the signals. The main application of Triroc 1A is PET time-of-flight but it can also be used for any application that requires both accurate time resolution and precise energy measurement. Triroc is available in  BGA packaging (12x12mm, 353 balls).

TRL Technology Readiness Level 6 - Application prototype available
Available Versions
  • Triroc 1A
Detector Read-Out  SiPM, SiPM array
Number of Channel 64
Signal Polarity Positive or Negative
Sensitivity Trigger on first photo-electron
Timing Resolution   88ps RMS

Packaging & Dimension 

  • TFBGA353 12x12mm
Dynamic Range 3000 photoelectrons (106 SIPM gain), Integral Non Linearity : 1% up to 2000 photoelectrons
Power Consumption

Power supply : 3.3V


Inputs 64 voltage inputs DC adjustment for SiPM HV tuning
  • Digital output (energy on 10-bit, time on 10-bit 100ps bin)
  • 1 multiplexed time trigger output
  • 2 ASIC trigger OR outpust (64 channels, 2 levels)
Internal Programmable Features
  • 64 HV adjustment for SiPM (64X8bits)
  • trigger threshold adjustment (10bits)
  • charge measurement tuning
  • ADC Track & Hold/Peak Sensing
  • 64 trigger masks
  • internal temperature sensor
  • channel by channel output enable
  • trigger latch
  • power pulsing
Evaluation systems
  • Evaluation board : 64 channels - available