Triroc, a Versatile 64-Channel SiPM Readout ASIC for Time-of-Flight PET

Triroc is a highly configurable SiPM readout ASIC intended for PET prototyping with time-of-flight capability. This 64-channel ASIC incorporates a dual triggering system that will flag the arrival photons and provides energy cut-off at a specified level. Time and charge measurements are performed internally by 40ps-bin TDC and 10-bit ADC. The analog design of this ASIC has been optimized for accepting positive and negative polarity inputs while maintaining nearly similar performances for both input polarities. Channel-by-channel input DC level adjustment is also available in order to correct the non-uniformity of SiPM array and fine tuning each pixel gain. Additionally, the digital conversions are assignable to other analog components, which extends the suitability of Triroc for any application requiring SiPM readout. The design of Triroc and the characterization results will be presented in this work.