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arXiv · 2607.02546

Direct Time-of-Flight Measurement Accuracy Improvement With Perimeter-Gated SPADs

Md Sakibur Sajal·Hunter Guthrie·Zexi Liu·Marc Dandin
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Abstract

Direct time of flight (dToF) measurements are susceptible to errors because of system-level and circuit-level timing jitters. In addition, device-level uncertainty stemming from the dark noise of single-photon avalanche diode (SPAD) contributes to the aggregated error. We demonstrate that perimeter gating can help reduce the device-level detection inaccuracy for SPAD devices by reducing the dark noise probability. Specifically, in this work, we developed a general framework to accurately estimate the dToF jitters stemming from different source levels and analyzed a counter-based time to digital converter (TDC) circuit that are commonly used in such systems. We have also measured dToFs using a perimeter-gated SPAD (pg-SPAD) detector fabricated in a 0.35 $μ$m standard CMOS process. Experimental results show that pg-SPADs can improve measurement accuracy in both free-running and time-gated operations.

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Md Sakibur Sajal, Hunter Guthrie, Zexi Liu, Marc Dandin. 2026-06-24. Direct Time-of-Flight Measurement Accuracy Improvement With Perimeter-Gated SPADs. https://arxiv.org/abs/2607.02546

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