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Time-tagging units and coincidence detectors are used in many scientificresearch fields. The required timing resolution and number of input channelsare varying, but some emerging experiments in the field of quantum opticsrequire up to 32 input channels with a timing resolution of approximately 10 psand high data processing capability. This work is about a custom designed FPGAbased time-tagging and coincidence detector unit, with 32 input channels, 8 psof timing resolution, high data processing capability and with high bandwidthcommunication ports, such as USB-3 and PCIe x4, for readout. With very hightiming resolution and many channels it is crucial to properly characterize theperformance of the time-to-digital converters in every input channel, tovalidate their accuracy. Important sources of error are discussed and a commonmethod of performance measurement is evaluated, together with its oftenoverlooked flaws. The performance measurement implemented in this projectcharacterizes every channel simultaneously, with no additional externalinstrument required except for an extra crystal oscillator on the PCB and abuilt in pattern generator in the FPGA. The advanced measurement is accurateenough to detect different type of jitters, from varying sources, measure noisecaused by power supplies, measure linearity and characterize every inputchannels in detail. The measurement results are presented and evaluated indetail. This board with its high performance, large number of input channelsand detailed characterization is currently unique and cutting edge.

A 32 Channel Time-Tagging and Coincidence Detector Unit with High Data Throughput