15 May 2017 High-performance integrated pick-up circuit for SPAD arrays in time-correlated single photon counting
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The analysis of optical signals by means of Single Photon Avalanche Diodes (SPADs) has been subject to a widespread interest in recent years. The development of multichannel high-performance Time Correlated Single Photon Counting (TCSPC) acquisition systems has undergone a fast trend. Concerning the detector performance, best in class results have been obtained resorting to custom technologies leading also to a strong dependence of the detector timing jitter from the threshold used to determine the onset of the photogenerated current flow. In this scenario, the avalanche current pick-up circuit plays a key role in determining the timing performance of the TCSPC acquisition system, especially with a large array of SPAD detectors because of electrical crosstalk issues. We developed a new current pick-up circuit based on a transimpedance amplifier structure able to extract the timing information from a 50-μm-diameter custom technology SPAD with a state-of-art timing jitter as low as 32ps and suitable to be exploited with SPAD arrays. In this paper we discuss the key features of this structure and we present a new version of the pick-up circuit that also provides quenching capabilities in order to minimize the number of interconnections required, an aspect that becomes more and more crucial in densely integrated systems.
Conference Presentation
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Giulia Acconcia, Alessandro Cominelli, Pietro Peronio, Ivan Rech, Massimo Ghioni, "High-performance integrated pick-up circuit for SPAD arrays in time-correlated single photon counting", Proc. SPIE 10229, Photon Counting Applications 2017, 102290A (15 May 2017); doi: 10.1117/12.2265523; https://doi.org/10.1117/12.2265523

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