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Sub-electron readout noise for low-light imaging
What is owly-eyed?
Today, markets such as medical, security, industrial vision, defence, scientific imaging and space are expected to grow and increase the demand for more sensitive CIS operating in low-light conditions.
Leti, technology research institute Commissariat à l’énergie atomique et aux énergies alternatives Minatec Campus | 17 rue des Martyrs | 38054 Grenoble Cedex 9 | France www.leti.fr Leti To further reduce the TRN in a standard CIS technology, without any process refinements, a new circuit-optimization technique has been developed. A detailed noise analysis of a classic CIS readout chain shows that the input referred 1/f noise can be reduced using three techniques that can be combined with each other:
Besides the read noise originating from the 1/f and thermal noise, the gate-leakage current shot noise, up to now, has been neglected due to the extremely low levels of the leakage currents achieved thanks to the used technology. The figure below also shows how the input-referred noise is expected to decrease, only by taking advantage of the technology downscaling.
• 3 publications in leading journals (JSSCC ; Sensors, IISW)
• Filed patents
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.