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An 8 &#x00D7; 16 pixel array based on CMOS small-area silicon photomultipliers (mini-SiPMs) detectors for PET applications is reported. Each pixel is 570 &#x00D7; 610 &#x03BC;m<sup>2</sup> in size and contains four digital mini-SiPMs, for a total of 720 SPADs, resulting in a full chip fill-factor of 35.7%. For each gamma detection, the pixel provides the total detected energy and a timestamp, obtained through two 7-b counters and two 12-b 64-ps TDCs. An adder tree overlaid on top of the pixel array sums the sensor total counts at up to 100 Msamples/s, which are then used for detecting the asynchronous gamma events on-chip, while also being output in real-time. Characterization of gamma detection performance with an 3 &#x00D7; 3 &#x00D7; 5 mm<sup>3</sup> LYSO scintillator at 20&#x00B0;C is reported, showing a 511-keV gamma energy resolution of 10.9% and a coincidence timing resolution of 399 ps.

ieee journal of solid-state circuits

A Fully Digital 8<formula formulatype="inline"><tex Notation="TeX">$\,\times\,$</tex></formula>16 SiPM Array for PET Applications With Per-Pixel TDCs and Real-Time Energy Output

A Fully Digital 8$\,\times\,$16 SiPM Array for PET Applications With Per-Pixel TDCs and Real-Time Energy Output