Petiroc 2

petiroc2 layoutPetiroc2 is a 32-channel front-end ASIC designed to readout silicon photomultipliers (SiPMs) with both polarities for particle time-of-flight measurement applications. Petiroc2 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 25ps-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 6 mW/channel, excluding buffers used to output the signals. The main application of Petiroc 2 is PET time-of-flight prototyping but it can also be used for any application that requires both accurate time resolution and precise energy measurement.

Detector Read-Out  SiPM, SiPM array
Number of Channel 32
Signal Polarity Positive or Negative
Sensitivity Trigger on first photo-electron
Timing Resolution  below 40ps

Packaging & Dimension 

Naked die - 4.6 x 4.2 mm - 20mm2, QFP160
Dynamic Range 3000 photoelectrons (106 SIPM gain), Integral Non Linearity : 1% up to 2500 photoelectrons
Power Consumption

Power supply : 3.3V

192mW ANalogue cire (excluding outing buffer), 6mw/ch.

Inputs 32 voltage inputs with DC adjustment for SiPM HV tuning
  • DIgital output (energy on 10 bit, time on 10 bit - 25ps bin)
  • 32 trigger outputs
  • 1 multiplexed charge output
  • 2 ASIC trigger outputs (Trigger OR on 32 channels, 2 levels)
Internal Programmable Features
  • 32 HV adjustment for SiPM (32X8bits)
  • trigger threshold adjustment (10bits)
  • charge measurement tuning
  • 32 trigger masks
  • internal temperature sensor
  • channel by channel output enable
  • trigger latch



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Petiroc2 product manager is Nathalie Seguin

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