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- Title
CMOS depth sensor with programmable filter circuits for environment-adaptive noise suppression.
- Authors
Seo, H.; Kim, B.; Chun, J.-H.; Kim, S.-J.; Choi, J.
- Abstract
This Letter introduces a CMOS depth sensor with a multi-resolution single-photon avalanche diode (SPAD) array and area-efficient filter circuit with a programmable reference for environment-adaptive noise suppression. Four SPADs compose a macro-pixel for detecting targets at a short distance with high resolution, whereas 4 x 4 SPADs are reconfigured to a super-pixel for a long distance with enhanced signal-to-noise ratio. To provide environment-adaptive noise suppression in the miniaturised SPAD array, an area-efficient filter circuit with a programmable reference is proposed: a digital macro-filter corresponding to a macro-pixel and an analogue super filter corresponding to a super-pixel. The prototype chip was fabricated with a 110 nm CMOS image-sensor process, including 128 SPAD farm arrays and 128 analogue front-end circuits. With high background light of over 90 klx and a high dark-count rate of over 27.1 kHz, the time-of-flight could be measured by filtering out invalid pulses from noise without using multiple time-to-digital converters per pixel, which enables the implementation of miniaturised LiDAR-sensor systems on a chip.
- Subjects
PROGRAMMABLE filters; INTEGRATED circuits; COMPLEMENTARY metal oxide semiconductors; DETECTORS; SIGNAL-to-noise ratio; SIGNAL processing
- Publication
Electronics Letters (Wiley-Blackwell), 2018, Vol 54, Issue 19, p1122
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/el.2018.5078