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SPAD-based flash Lidar with high background light suppression

: Schrey, Olaf; Beer, Maik; Brockherde, Werner; Hosticka, Bedrich J.


Zachäus, Carolin:
Advanced Microsystems for Automotive Applications 2017 : Smart Systems Transforming the Automobile; held in Berlin on September 25 and 26, 2017, International Forum on Advanced Microsystems for Automotive Applications (AMAA)
Cham: Springer International Publishing, 2018 (Lecture notes in mobility)
ISBN: 978-3-319-66971-7 (Print)
ISBN: 978-3-319-66972-4 (Online)
International Forum on Advanced Microsystems for Automotive Applications (AMAA) <21, 2017, Berlin>
Fraunhofer IMS ()
light detection and ranging (LIDAR); Time-of-Flight (ToF); CMOS-Chip

In this contribution, we present the concept of a 4×128 pixel line sensor for direct time-of-flight measurement based on single-photon avalanche diodes (SPAD) fabricated in a high-voltage automotive 0.35 μm CMOS process. An in-pixel time-to-digital converter with a resolution of 312.5 ps determines the arrival of photons reflected from targets in the area of view. Since we are employing a so-called first photon approach, there are no dead-time effects. In addition, our approach uses a variable photon coincidence detection to suppress effects of ambient illumination. As a test vehicle we have implemented a 1×80 pixel CMOS SPAD line sensor and characterized it.