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2x192 pixel CMOS SPAD-based flash LiDAR sensor with adjustable background rejection

: Beer, Maik; Thattil, Charles; Haase, Jan F.; Brockherde, Werner; Kokozinski, Rainer


Institute of Electrical and Electronics Engineers -IEEE-:
25th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2018 : 9th - 12th December 2018, Bordeaux, France
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-9562-3
ISBN: 978-1-5386-9116-8
International Conference on Electronics, Circuits and Systems (ICECS) <25, 2018, Bordeaux>
Fraunhofer IMS ()
photon coincidence; single-photon avalanche diode (SPAD); Time-of-Flight (ToF); range imaging; light detection and ranging (LiDAR)

In this paper we present a 2×192 pixel SPAD-based sensor for LiDAR applications fabricated in a 0.35 μm standard CMOS process. Distance measurement is performed using the direct time-of-flight technique. For time acquisition a DLL-based pixel-parallel TDC with 312.5 ps resolution and a 1.28 μm range is integrated. Employing four single SPADs in each pixel enables background light suppression by detecting temporal correlated photons. Moreover, by using adjustable correlation parameters the dynamic range is increased significantly allowing a constant range at varying target reflectivity.