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A multipurpose monolithic array of 2 &#x00D7; 2 multichannel digital silicon photomultipliers (MD-SiPMs) fabricated in 40-nm CMOS technology is presented. Each MD-SiPM comprises 64 &#x00D7; 64 smart pixels connected to 128 low-power 45-ps sliding-scale time-to-digital converters (TDCs). The system can operate in two different modes: 1) event-driven and 2) frame-based. The first is suited for positron emission tomography (PET) and the second for synchronous applications like LiDAR. The design includes electronics to capture gamma events by means of a scintillator. The digital readout is fully embedded in the sensor and it is reconfigurable by SPI. Data packets are sent following a simple protocol compatible with an external FIFO, therefore making use of an FPGA optional. Every MD-SiPM can deliver up to 64M time-stamps/s. The sensor can be arranged in any type of configuration through a dedicated synchronization input and can be used to operate jointly with an event generator, such as a pulsed laser, which is useful in many applications. Inherently compatible with 3-D-stacking technology, the sensor can serve as front-end electronics when it is used with a different SPAD silicon tear.

ieee solid-state circuits letters

Multipurpose, Fully Integrated 128 <inline-formula> <tex-math notation="LaTeX">$\times$ </tex-math></inline-formula> 128 Event-Driven MD-SiPM With 512 16-Bit TDCs With 45-ps LSB and 20-ns Gating in 40-nm CMOS Technology

Multipurpose, Fully Integrated 128 $\times$ 128 Event-Driven MD-SiPM With 512 16-Bit TDCs With 45-ps LSB and 20-ns Gating in 40-nm CMOS Technology