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A 128 x 128 SPAD Dynamic Vision-Triggered Time of Flight Imager

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Original languageEnglish
Number of pages4
Publication statusPublished - 23 Sep 2019
EventEuropean Solid-State Circuits Conference: ESSCIRC - Krakow, Poland
Duration: 24 Sep 201926 Sep 2019


ConferenceEuropean Solid-State Circuits Conference
Abbreviated titleESSCIRC 2019


A 128 x 128 SPAD motion detection-triggered time of flight (ToF) sensor is implemented in 40nm CMOS. The sensor combines vision and ToF ranging functions to only acquire depth frames when inter-frame intensity changes are detected. The 40μm x 20μm pixel integrates two 16-bit time-gated counters to acquire ToF histograms and repurposes them to compare two vision frames without requirement for additional out-of-pixel frame memory resources. An embedded ToF and vision processor performs on-chip vision frame comparison and binary frame output compression as well as controlling the time-resolved histogram sampling. The sensor achieves a maximum 20kfps in vision modality and 500fps in motion detection-triggered ToF over a measured 2.55m range with 1.6cm accuracy. The vision function reduces the sensor power consumption by 70% over continuous ToF operation and allows the sensor to gate the ToF laser emitter to reduce the system power when no motion activity is observed.


European Solid-State Circuits Conference: ESSCIRC


Krakow, Poland

Event: Conference

ID: 112507011