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T: Fachverband Teilchenphysik

T 23: DAQ, Trigger, Elektronik 1

T 23.3: Talk

Monday, March 24, 2014, 11:30–11:45, GFH 01-731

STiC v2 - A Silicon Photomultiplier Readout ASIC with Very High Timing Resolution — •Huangshan Chen — Kirchhoff Institut fur Physik, Universitat Heidelberg

STiC v2 is a 16-channel mixed mode readout ASIC for Silicon Photomultiplier (SiPM) with very high timing resolution. The chip is designed in UMC 0.18um COMS technology and aiming for ToF applications in medical imaging and High Energy Physics (HEP). The differential frontend of the chip is designed to reject the common-mode noise from both internal digital parts and external sources. However, the chip allows for either single-ended connection or differential connection to SiPM. The time and charge information from the SiPM signals are encrypted into two time stamps, which are then processed by the build-in TDC module with a time resolution better than 20ps. The digitized data is first stored in an on-chip memory and then transferred to external DAQ system over a 160Mbit/s LVDS serial link using 8/10bit encoding. The chip provides a linear SiPM bias tuning range of ~700mV to compensate the breakdown voltage variation of SiPMs. A special linearized time over threshold technique has been implemented to provide a linear response to the charges from 3pC to several nC. A Single Photon Time Resolution (SPTR) of ~180ps has been measured with a fast laser system and Hamamatsu MPPC S10362-11-100. With Hamamatsu MPPC S10362-33-050C, 3.1mmx3.1mmx15mm LYSO crystals and 22Na source, a minimum Coincidence Time resolution (CTR) of ~220ps has been obtained using STiC v2. Future applications in HEP are the tile and fiber trackers for the planned Mu3e experiment.