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PETIROC

 

Abstract

PETIROC is a 32-channel front-end ASIC designed to readout siliicon photomultipliers (SiPMs) with both polarities for particle time-of-flight measurement applications. PETIROC 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 4ps-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 analogue 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.


PETIroc at a glance

ASIC name : PETIROC (Positon Emission Tomography Integrated ReadOut Chip)
Current available version : 2A
Number of channel : 32
Polarity of input signal : Negative, Positive
Detector read out : SIPM, MPPC, RPC, compliant with PM, MA-PM 
noise : To be determined
Gain : To be determined
Max input signal : 2500 photelectrons at min gain


PETIroc features

Inputs-outputs

PIN name

PIN type and direction

PIN description

IN<31:0>

Analogue input bus (width=32)

Voltage sensitive analogue input to be connected to the detector

OUT_HG, OUT_LG

Multiplexed Analogue outputs

High Gain & Low Gain Charge output (respectively)

T<31:0>

Digital output

32 Triggers outputs (direct triggers or latched ones)

HIT_MUX

Multiplexed digital output

Provides the trigger value of the 32 channels, sequentially

OR32

Digital output signal

Provides a logical OR of the 32 triggers, asynchronous signal

 

PETIROC capabilities

To be determined

 

PETIROC characteristics

Embed measurement and perf outlook here

 

PETIROC in experiments

PEBS, MuRAY, E40 @ JPARC, SIPMED