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Sony publishes an article "Sony’s Latest Image Sensors and the Technologies that Lies Behind Them." Few quotes:
"There are various types of ToF, and we focused on developing an indirect-ToF (iToF) method that works by measuring the phase delay of returning light after it has been reflected by the target object. To realize this sensor, we developed a new back-illuminated CAPD (Current Assisted Photonic Demodulator) by combining CAPD technology, which is an IP of Sony Depthsensing Solutions, with Sony’s back-illuminated CMOS image sensor technology.
Making the most of the back-illuminated structure, it efficiently converts light into electrons, enabling time detection of under 50 picoseconds and greatly improving distance resolution."
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